Trivia: In the open-matte print, right after the credits, the support beams of the movie lot walls are visible, painted in blue to simulate the sky. In the theatrical version and the current Disney+ streaming movie's original aspect ratio (bottom picture), one can still see the beams for a split second after the postman puts the letter in the mailbox (though there's no way here to identify them as lot walls).
Trivia: After Tony blows off Bucky's arm, Cap picks up his shield and shields himself from Tony's blasts. At the very end of the shot, Tony is firing a beam at Cap which lands on Cap's shield and the shot begins to slow down. This moment from the shot is an homage to the cover from part 7 of the Marvel Civil War comic storyline, where Captain America and Iron Man are fighting on the front cover in the same way. (02:07:00)
Trivia: All the cast and crew (including the producer) had to undergo a grueling one week of military training (which they dubbed their 'week of hell') under the supervision of a battle hardened ex-navy SEAL. By the end most people were naturally eager to give their trainer a little of his own medicine. Miss Jovovich (Alice) did: he's the zombie she head kicks into the test-tube cabinet and then steals the gun from (before fighting the zombie dogs). What sweet justice.
Trivia: The man who is getting a (fake) haircut as Akeem first enters the barber shop is played by a then-unknown Cuba Gooding Jr.
Trivia: The infant playing Connie and Carlo's baby son Michael Francis Rizzi who Kay holds during the christening scene is Sofia Coppola, Francis Ford Coppola's daughter, who was born in May 1971. Sofia later had a prominent role in Part III as Michael's daughter, Mary. Other than the main characters, Sofia is the only actor to have appeared in all three films. In The Godfather II, she can be briefly seen as an immigrant girl on the ship that brings Vito Corleone to Ellis Island.
Trivia: For a single frame, one can see the structure that holds the Kong puppet. The first time it's still visible in modern copies at time code 00:52:36 (after the people run away on a log used as a bridge). The second one was digitally removed years ago, and it takes place when Kong exits the cave right after Ann faints. (00:52:36 - 01:05:30)
Trivia: Not a mistake, just something that's not immediately obvious: When they arrive at the plane after the club scene, the man that walks them to the plane is Dan Aykroyd.
Trivia: The bear that Jack Ryan brings home to his daughter is the exact same bear Bruce Willis brings to his son in Die Hard (both films were directed by John McTiernan). (02:06:00)
Trivia: There are nods to the fictional brands Red Apple cigarettes and Big Kahuna burger used in Quentin Tarantino's films, because he was dating Mira Sorvino at the time.
Trivia: Stan Lee makes his usual cameo, this time as a patient at the asylum where Selvig is being held.
Trivia: In the opening musical sequence when they jump out of the pool, the lady behind Austin can be seen laughing because her swim hat has fallen down.
Trivia: When Kevin is in Buzz's bedroom, he finds in the box a picture of Buzz's girlfriend. This is actually a picture of the art director's son dressed up to look like a girl, because the director, Chris Columbus, thought it would be too harsh to make fun of a girl like that.
Trivia: Christian Bale dropped approximately 60 pounds for the role, going from 180 to 120, by eating a diet of one can of tuna and an apple a day for months. This is the most weight ever lost by an actor for a film role. Within 6 months of this film he then put on 100 pounds to play Batman in Batman Begins. He actually gained so much weight he was too big for the batsuit and had to drop 20lb for filming.
Trivia: There is a scene where Hercules is being painted on the side of a vase or something. Hercules is wearing a lion skin - when he throws the lion skin down, if you look carefully, you can see that the lion skin is made out of Scar, from The Lion King . (00:55:20)
Trivia: When Rory is walking down the street wearing the Predator mask, there is a bright red/orange alien walking toward him. This is a nod to the original Predator costume that looked like a big bug, the red/orange color was used to film the stealth camouflage scenes. The bug suit was scrapped after a few test shots proved how silly it looked. Jean-Claude Van Damme was in the original costume, but he was let go when the costume was scrapped. (00:45:20)
Trivia: On Burt Reynolds' hat is the shape of Florida with a star. The star marks the location of Jupiter, where Reynolds lived much of his life, had a ranch, and eventually passed away.
Trivia: Samuel Jackson spotted that the eye patch his character wears in the movie switched eyes in the promotional posters announcing the movie in Los Angeles.