In Citizen Kane (1941), the audience that watches Kane make his speech is a still photo. To give the illusion of crowd movement, holes were pricked in with a pin, and lights moved around behind it.
Sid, from Ice Age, makes a cameo appearance in the movie Robots (2005).
3Gangs of New York
In Gangs of New York (2002), you can see the foam rubber meat cleaver bounce off of Monks’ back and land on the ground behind him.
For Forrest Gump (1994), Tom Hanks’s brother Jim Hanks doubled for him for the sequence where Forrest jogs across America. As Jim put it: “Tom had other doubles, but they couldn’t do the run,” he says, referring to Gump’s stiff, geeky stride. “That’s a stupid Hanks thing.”
The actor in Hot Fuzz (2007) kept forgetting his line so they let him use his real birthday. Happy Birthday, Underage Drinker #1.
6Beverly Hills Cop III
In Beverly Hills Cop III (1994), Eddie Murphy cuts into line at the Spider ride, in front of George Lucas.
In Octopussy (1983), when the jet flies through the hangar, you can clearly see that it was attached to a car with a pole and driven through the building.
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In Avengers: Endgame (2019), Korg shows signs of moss growth due to the nature of his and Thor's lazy lifestyle.
In Forrest Gump (1994), when Forrest starts his speech and the microphones cut out and you can’t hear him. He actually said “Sometimes when people go to Vietnam, they go home to their mommas without any legs. Sometimes they don’t go home at all. That’s a bad thing. That’s all I have to say about that.”
In Up (2009), the dog to the very right has an ace of clubs in his collar.