Trivia: When Megamind as Bernard is in the library with Roxanne, the book he is reading ("Megamind Unmasked") has a description on the back of a self-help book entitled "The Happiest Me I Can Be". This is the same book that Metroman read (shown later in flashback) that caused him to decide to cease to be a hero. (00:43:30 - 01:08:30)
Trivia: The creature that hunts down the Doctor before being shot down by the Sniper girl is actually the original design of the Predator that was scrapped during Predator 1 due to issues with the costume and the jungle. The original Predator was supposed to be very slender with backwards knees and long arms, but because of the jungle setting, it was scrapped because the director was unable to make the costume work properly.
Trivia: During the film's climax, a young boy in an Iron Man mask is shown standing up to one of the Hammer drones with Iron Man swooping in and destroying the drone and giving the kid the credit. Following Spider-Man's inclusion in the Marvel Cinematic Universe, a fan theory suggested the young boy was Peter Parker, which Marvel Studios President Kevin Feige and Spider-Man actor Tom Holland would later retroactively confirm.
Trivia: The movie was originally scripted with a male lead and Tom Cruise was approached to play the title character. Ultimately, he backed out and the script was rewritten with a female lead and Angelina Jolie took the role.
Trivia: Just before Hannibal, Face and BA break Murdoch out of the hospital by driving the hummer through the wall, watch the credits rolling on the screen of the movie they are watching. Reginald Barclay is the character that Dwight Schultz (the original Murdoch) played on Star Trek: The Next Generation, and the 2nd name ends with "StarBuck", the character played by Dirk Benedict (the original Face man) on Battlestar Galactica. We also see "Thomas", with the surname obscured - likely "Thomas Banachek", a character played by George Peppard, the original Hannibal.
Trivia: This was Tony Scott's final feature film before his death in 2012.
Trivia: In a shot of Zeus sitting on the throne, Emma Thompson, in costume as Nanny McPhee, is actually hiding behind the throne - they were filming next to each other. The story was related during an interview - she sneaked on set during a break, sat on Liam Neeson's lap and said "I think you've been a very naughty boy". He suggested she stay when filming resumed, as the shot wasn't going to be on him anyway, but she didn't want to throw off Ralph Fiennes, so hid behind the throne to get out of the way, and a shot of it with her hidden behind, unseen, is in the movie.
Trivia: After Robin and his men arrive in Nottingham, Will Scarlet and Little John are in a tavern admiring the women - Will advises his comrades not to go for the most beautiful woman, but to go for her less attractive friends, thus ensuring success. This is the expression of Game Theory, as explained by John Nash (also played by Russell Crowe) in A Beautiful Mind.
Trivia: The two 'disc jockeys' in the soundbooth of the 'End of Line' club are actually Daft Punk, the French group that created the movie's soundtrack.
Trivia: Whilst this movie is a remake of the 80's Karate Kid, and is named the same, no actual karate is performed at all. It's all kung-fu.
Trivia: In the opening scene with Richard Dreyfuss fishing on the lake he is singing to himself "show me the way to go home". This is a nod to the movie Jaws because it is the song that he sang along with the rest of the crew as they waited for the tagged shark to be re-sighted. (00:01:00)
Trivia: John Travolta is handed a bag of burgers. He takes one out and hands it to his partner, and calls it a Royale With Cheese. A nod to Pulp Fiction, where Travolta explains to Samuel L. Jackson that in France, they call a Quarter Pounder with cheese a "Royale with Cheese".
Trivia: Frank Moses' file, seen when Cooper is told he is his next target, gives Frank's date of birth as March 19, 1955. This is Bruce Willis' date of birth. (00:15:00)
Trivia: Sylvester Stallone sustained 14 injuries during filming, including breaking a tooth, rupturing his ankle and getting a hairline fracture in his neck that required the surgical insertion of a metal plate. He even had bronchitis and shingles during the shoot.
Trivia: Make sure to stay after the ending credits to see Will Ferrell and Mark Wahlberg in a restaurant being quite comical.
Trivia: When Jackie confesses that he was orphaned and lived in a group home, this is true for both his character and in real life. Jackie's parents gave him up to the Peking Opera House because they could not afford to raise a child. There he learned how to sing and acrobatics along with his "brothers and sisters."
Trivia: Stay after the credits start rolling for a hilarious extra scene.
Trivia: Leon Kennedy, a popular character from the games, was originally intended to be in the film but was dropped. He later appeared in the fifth film.