The Punisher's ally Micro (Ebon Moss-Bachrach) was once mentioned in Agents of S.H.I.E.L.D. (2013) by Skye as a hacker in the Rising Tide group, and later in Daredevil (2015) as a disc with his name on it.
Stan Lee has a cameo in a poster like the other Marvel-Netflix series but it's brief and very easy to miss
As of December 13th, 2017, The Punisher (2017) has been renewed for a second season.
The Punisher made his first appearance in the pages of The Amazing Spider-Man # 129 in February 1974. He was originally going to be a minor second string character due to his penchant for killing, but due to his popularity, he became a more prominent figure in the larger Marvel Universe.
In episode 3, Ben Barnes's character is on his cot reading "Picture of Dorian Gray." Ben Barnes played the title character Dorian Gray in 2009.
When Billy Russo is calling for Frank on the radio, Frank's call sign is Raven. In the comics, Frank is a Vietnam vet who is the best at killing and warfare, much like John Rambo, who, when his former colonel is trying to call him on the radio in the movie First Blood is revealed that his call sign is Raven.
Marvel and Netflix had to pull the series from the 2017 New York Comic Con panel due to the Las Vegas shooting.
In all shots of the New York skyline the Stark building is missing as it should be near the Empire State Building as it was featured in both avengers movies and Spider-Man Homecoming
A special shotgun was made for Amber Rose Revah to use, designed for her height and stature.
While waiting for Frank in the woods, David (Micro) Lieberman is seen reading the book Life of Pi by Yann Martel. Earlier, when Frank visits Lieberman's house, Leo (Micro's daughter) discusses the book with Frank while repairing the car. She then gives him her copy to read.
Jon Bernthal is the fourth to portray Frank Castle/ The Punisher (in a live-action role). He was played by Dolph Lundgren in 1989, Thomas Jane in 2004, and Ray Stevenson in 2008.
At the end of the first episode Micro says "Welcome back, Frank", a nod to the Garth Ennis/Steve Dillon comic book story which brought the Punisher back to popularity.
Daniel Webber who plays Lewis Wilson previously played a similarly disturbed young man, Lee Harvey Oswald, in 11.22.63 (2016).
Shohreh Aghdashloo and Amber Rose Revah who played mother and daughter on the series also played mother and daughter on the miniseries House of Saddam (2008) which Steve Lightfoot worked as a producer.
Ripley Sobo portrayed Sage in Batman v Superman: Dawn of Justice (2016). This makes her one of the few actresses to date to have appeared in both the Marvel Cinematic Universe and the DC Extended Universe.
Ben Barnes, who plays Billy Russo, played the on-screen father of Charlie Cox in Stardust (2007). Cox appears along with Jon Bernthal in Daredevil (2015).
The photo on the dresser of Dinah Madani's nightstand is a picture of Shohreh Aghdashloo's book cover of her memoir: The Alley of Love and Yellow Jasmines
This is Shohreh Aghdashloo's second comic-book feature, after X-Men: The Last Stand (2006).
Brett Mahoney (Royce Johnson) third appearance in Netflix Marvel. Previously seen in Daredevil and Jessica Jones.
Jon Bernthal (Frank Castle) and Jaime Ray Newman (Sarah Lieberman) worked in 'Eastwick' together and played estranged spouses
Shohreh Aghdashloo is the seventh actress from Star Trek to appear in the Marvel Cinematic Universe after Chris Hemsworth, Idris Elba, Zoe Saldana, Alfre Woodard, Benedict Cumberbatch and Karl Urban.
Mary Elizabeth Mastrantonio who plays Marion in the show also played another Marian in Robin Hood: Prince of Thieves (1991) opposite Kevin Costner (Robin Hood).
Tim Guinee, who plays Lewis' father Clay Wilson in this, also played another character in the MCU, Major Allen, in Iron Man (2008) and Iron Man 2 (2010).