Woody Allen did not tell the actors that it was a musical until after they signed their contracts.

The actors sing their own songs except for Drew Barrymore, who convinced Woody Allen that her singing was too awful even for the realistic singing voices he was after. She said she doesn't even sing in the shower.

Woody Allen had to tell Goldie Hawn to try to sing worse because she sang too well to be believable as a normal person just breaking into song.

Drew Barrymore had to wear a wig because her hair was purple at the time.

Tracey Ullman and Liv Tyler filmed scenes for this film, but all were cut by director Woody Allen to reduce running time.

Edward Norton proved to be such a good singer that Woody Allen had to ask him to sing less well.

Drew Barrymore was the only member of the cast to be dubbed for her singing. Olivia Hayman provided her voice.

The first Woody Allen film since Love and Death (1975) to be shot outside of New York.

Bob (Alan Alda)'s guest for the dinner party, Arnold, is played by David Ogden Stiers, Alda's co-star and roommate on M*A*S*H (1972) for 6 years.

The title of the film comes from a song in The Marx Brothers movie Horse Feathers (1932). One of the songs, "Hooray for Captain Spaulding" (which is sung in French), is from another Marx Brothers movie, Animal Crackers (1930). Another soundtrack song, "You Brought a New Kind of Love To Me," was sung by the Marx Brothers imitating Maurice Chevalier in Monkey Business (1931).

When shooting the dance numbers, Woody Allen followed the Fred Astaire method of filming the dance routines in one or a few continuous camera shots, showing the dancer(s) from head to foot.

In the Harry Winston dance sequence, Edward Norton's dancing resembles that of Groucho Marx in Animal Crackers (1930), the character celebrated later in this film, when they perform Hooray for Captain Spaulding in French.

The narrator, D.J. (played by Natasha Lyonne), says that her real name is Djuna (after the novelist Djuna Barnes, who wrote Nightwood). Barnes was later a very minor character in Woody Allen's 2011 movie Midnight in Paris (2011).

Was chosen by Time Magazine as one of the "Best of Film 1996" at position #8 in the in their year end review issue dated December 23, 1996.

One of three films where Woody Allen directed and acted alongside Alan Alda. The other two films were Crimes and Misdemeanors (1989) and Manhattan Murder Mystery (1993).

In the foreign release of this film, the producers wanted all the singing in English, and all the dialog dubbed. There is one scene where Goldie Hawn is speaking while Alan Alda is singing live on the set. This segment of singing had to be re-dubbed into English by vocal contortionist Jeff Bergman, with the segment produced by Roy B. Yokelson.

Julia Roberts and Natalie Portman would go on to work together again in Closer (2004), which was released eight years later.

Kim Rossi Stuart's role in the film ended up on the cutting room floor.

The film cast includes four Oscar winners: Woody Allen, Goldie Hawn, Julia Roberts and Natalie Portman; and three Oscar nominees: Edward Norton, Tim Roth and Alan Alda.

Referred to, in the title story of the short-story collection 'We Were Writers for Disastrous Love Affairs Magazine' by Adam Thomlison, as "that Woody Allen musical." It is to date Allen's only musical.

Film debut of Paolo Seganti.

This was the first of two films in which Natalie Portman (Laura Dandridge) appears with "I Love You" in the title. The second was New York, I Love You (2008).

Billy Crudup is included in the cast along with Julia Roberts and Natalie Portman whom he doesn't share any scenes. Years later, he would star opposite Roberts in Eat Pray Love (2010) and Portman in Jackie (2016).