Following the failure of Gigli (2003), Miramax removed all images of Jennifer Lopez from all promotional spots, out of fear that people would think it was another Ben Affleck-Jennifer Lopez vehicle. The release date for Jersey Girl (2004) was pushed back from autumn 2003 to early 2004 and the studio also attempted to play down the presence of Lopez's character, Gertrude, in the movie, which included a public revelation about her character's fate.

Ben Affleck's character's name comes from the first name of the popular DC superhero, Oliver "Ollie" Queen, a.k.a. Green Arrow. Kevin Smith wrote fifteen issues of Green Arrow just prior to working on this film.

Kevin Smith originally wanted to include some clips from Jaws (1975) for a scene where Ollie explains "the birds and the bees" to his daughter, but Steven Spielberg denied Smith permission.

Based on Writer and Director Kevin Smith's experiences as a father.

After Armageddon (1998), this is the second film in which Liv Tyler and Ben Affleck play a couple.

A special premiere was held at Paulsboro High School, where several scenes in the movie were filmed. Smith liked the town so much, and the town liked him, a street leading out of the school was named Kevin Smith Way.

One of the rooms of the house has a wall of framed black-and-white photographs. Some of these are young photos of George Carlin, most noticeably a bust shot of him dressed for the Air Force, which he had joined at the age of eighteen.

Kevin Smith wrote the Maya character with Eliza Dushku in mind, but didn't go with her because she would have looked like "Ben Affleck's daughter instead of his girlfriend. She's tiny".

Jason Mewes was originally intended to play Arthur Bankman, but his problems with substance abuse caused him to drop out. Jason Lee also auditioned for this role, which ultimately went to Jason Biggs.

The first of Kevin Smith's films to be rated PG-13 in the U.S., although it was initially rated R, until appeal.

The film's DVD release was promoted with a tongue-in-cheek commercial, in which Kevin Smith begs people to buy his DVD so that he has enough money to keep his sexy wife happy.

Production halted until Summer 2002, due to Ben Affleck's work on Daredevil (2003).

When the script was first written, it was a number from "Cats" that Gertie was to perform at her school play, but the show closed before filming started. It was replaced with a number from "Sweeney Todd: The Demon Barber of Fleet Street".

Ollie refers to losing a bet and having to watch a musical on roller skates. The musical he's talking about is "Starlight Express" written by Andrew Lloyd Webber and Richard Stilgoe.

"Angelloti's", the firm where Ollie Trinke gets an interview near the end of the film, is Kevin Smith's own publicist.

In the video shop, a film poster for Scream 3 (2000) is visible. This film features cameo appearances from Jason Mewes and Kevin Smith as Jay and Silent Bob.

This was the first film written and directed by Kevin Smith in which he did not appear.

Scenes were filmed at The New Berlin Diner in Berlin, New Jersey. Thousands flocked to catch a glimpse of the stars. There is still (as of March 2007) a display of photographs on the wall.

Originally, Bruce Willis was to be the star Ollie badmouthed (when it was set in the late-eighties), but a deal with Willis couldn't be secured.

Joey Lauren Adams was originally considered for the part of Gertrude Steiney. But Kevin Smith thought that pairing her with Ben Affleck again, would make the film look too similar to Chasing Amy (1997). So they went with Jennifer Lopez.

Gertie's school, where she and Ollie perform the bloody and violent song from Sweeney Todd, is named for Maria Goretti, a Catholic saint who was martyred by being stabbed to death.

While generally not considered part of Kevin Smith's "Askewniverse" series, the film does have one potential tie-in character and actress: Betty Aberlin portrays an unnamed nun in this film and Dogma (1999), her role being substantially larger in this film.

Kevin Smith has acknowledged that his crush on Stacie Mistysyn prompted his naming of Clerks (1994) character, Caitlin Bree, in honor of Mistysyn's Caitlin Ryan character (from Degrassi High (1987), School's Out! (1992), and Degrassi: The Next Generation (2001)), and subsequently tried to cast her in Mallrats (1995). However, in spite of all this adulation, it appears that he titled this film before knowing of Mistysyn's Jersey Guy (2003) released only a few months earlier. Smith would later guest star on five episodes of Degrassi: The Next Generation (2001), as a fictional representation of himself, flirting with, and attempting to seduce, Caitlin Ryan.

A twelve-second wedding scene with Ollie and Gertrude was cut from the final version, after Ben Affleck and Jennifer Lopez ended their engagement. Kevin Smith said that he didn't want to risk "the chuckle factor".

Matt Damon has a cameo on the film.

Jason Biggs is the only major cast member that hails from New Jersey (and all his scenes take place in New York City).

Ollie and Gertie refer to the street sweeper as the Batmobile. Ben Affleck was later cast as Bruce Wayne, a.k.a. Batman in Batman v Superman: Dawn of Justice (2016) and Suicide Squad (2016). Also, a video cassette of Batman Forever (1995) can be spotted in the video store that Ollie and Maya are in during one scene.

Kevin Smith's commitment to this film was so demanding, that he couldn't finish two Marvel comic books that he began. The first being "Daredevil: The Target", which didn't get past issue one. The second, being "Spider-Man and the Black Cat", which he promoted on an episode of the Jay Leno show, but only got to issue three, leaving the readers in suspense as to the Black Cat's fate at the edge of issue three's cliffhanger ending. Smith did go back to complete the final three issues of the book three years later.

Cinematographer Vilmos Zsigmond said that Kevin Smith just wanted to shoot everything in close-up shots, "all those talking heads", since the film was heavily based on dialogue. Smith, on the other hand, said that he moved out of his comfort zone to work with Zsigmond, and the set was mainly built to Zsigmond's specifications. While Smith at one point referred to him as "an ornery old cuss, who made the crew miserable", he admitted that Zsigmond taught him a lot about lighting, and pushed Smith to be more visual in his storytelling. Later, Smith also said that Jersey Girl "looks far better than it has any right to".

One of the videotapes seen at the video store is Stealing Beauty (1996), which stars Liv Tyler (Maya Harding).

Was originally scheduled to be released in December 2003, but pushed back to March 2004, in part to avoid competing with The Lord of the Rings: The Return of the King (2003), and also to accommodate potential re-shoots that would have added more scenes with Jennifer Lopez, after her and Ben Affleck's relationship made the tabloid headlines. Ultimately, the re-shoots never went ahead, largely due to Kevin Smith pointing out that the volume of footage the studio wanted him to add, would have made the film over two-and-a-half hours long.

In the second video store scene, Ollie is standing next to a copy of Shakespeare in Love (1998), in which Ben Affleck appeared. Video copies of two of Affleck's other films, Good Will Hunting (1997) and Phantoms (1998) are visible throughout the movie as well.

Ben Affleck and Liv Tyler previously starred in Armageddon (1998) with Bruce Willis. Kevin Smith also later worked with Willis on Cop Out (2010).

Kevin Smith says that it was his wife Jennifer Schwalbach Smith who suggested to cast Jennifer Lopez alongside Ben Affleck, since she had seen Lopez in The Wedding Planner (2001). Affleck had already considered the same idea, and sold her on the part.

The emergency room that Ollie and Gertie went to deliver the baby is the emergency room of the now closed Mercy Community Hospital in Havertown, Pennsylvania, which, by the way, never had that many staff members working in it when it was open. It also never had a maternity department. It's obvious that it is not in the New York City area, by the fact that it has only six beds, four curtains and two rooms.

The film takes place from December 1994 to November 2003.

Gertie Trinke was born on June 1, 1996.

Ollie Trinke was born in 1967.

Maya Harding was born in March 1978.

While Ollie's in the video store, the movie Bounce (2000) - with Ben Affleck - is shown in the background as he's walking around.

Kevin Smith stated in 2013 he was working on an extended cut of this film which he said had Jennifer Lopez's death happening around the 45 minute mark. However this cut has never been released.

Ben Affleck's character says "Daddy doesn't want to drive the bat mobile" but later on he would in Batman v Superman: Dawn of Justice (2016).

Kevin Smith: [Star Wars] When Ollie picks Gertie up from school in the street sweeper, she says, "Punch it, Chewy."

Kevin Smith: [Comics] Ollie and Gertie refer to the street sweeper as the Batmobile.

On the tombstone, it is indicated that July 24 is Gertrude's birthday. This date is Jennifer Lopez's actual birthday.

Towards the end of the film, Ben Affleck's character Ollie talks to Will Smith (playing himself) at a publicists' office while waiting for an interview. Affleck and Smith would later meet again as Batman and Deadshot, respectively, in Suicide Squad (2016).

Gertrude Steiney Trinke was born on July 24, 1968, and died on June 1, 1996.