- This film is the directorial debut of " The Hangover " screenwriter Jon Lucas and Scott Moore.
- Korean actor Justin Chon played Jeff Chen in the film. When the film was released, he was 31 years old, but the role he played was only 21 years old.
- There is a part of the plot the film shot in China's Linyi City of Shandong Province, during filming in China, has taken the " Sophies Revenge " of Lin Peipei as the staff involved in the Chinese film crew.
- The film "Do 21 & Over" (also known as " 21 & Over ") is very pure in blood. The screenwriter and director of this film are the two screenwriters of "The Hangover", Jon Lucas and Scott Moore.
- All the main actors in the film are all young faces. Although the protagonist Justin Chon is in his early 30s this year, he is still a post-80s actor.
21 & Over behind the scenes gags
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Miller: Look, JeffChang, this isn't just any birthday.OK? This is your 21st birthday.
Casey: Here we go!
Miller: This is the day that you become a man.This is the day that you get to tell every bouncer who's ever carded you,"You know what? Sure, I get it.Yes, I look like a nine-year-old Chinese girl."
Jeff Chang: What the fuck?
Miller: "But guess what?Today is my 21st fucking birthday.So, step aside and let the man come through."
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Miller: [Forced to kiss eachother] I just... I wish you were wearing more than a tube sock, but fuck it, baby.
Casey: I really wish you didn't call me baby.