1I Am Legend
In 'I Am Legend' the mannequin that makes Will Smith's character freak out actually moves its head.
In The Incredibles, there was a hero named Downburst who could fly, and defeat enemies, with his farts.
While filming The Exorcist (1973), director William Friedkin was notorious for hiding guns around the set so he could fire them during takes, startling his actors to get genuine reactions.
In Spider-Man: Homecoming (2017) Howard Stark can be seen painted on a mural celebrating great scientists and inventors.
In Sully (2016), the ferry captain Vincent Lombardi, who was the Captain of the first ferry to reach the plane, played himself in the movie.
In The Avengers (2012) post-credits scene at the Shawarma stall, Captain America (Chris Evans) is seen resting his face on his hand and not eating anything. This is because the scene was shot too late (after the premiere) and Evans - who was working on Snowpiercer (2013)- had grown a beard.
The first terrorist to be killed by Tony Stark in Iron Man is Tom Morello, the guitarist for Rage Against the Machine and Audioslave. Audioslave's song "Cochise" was used in the second trailer for the movie.
In Labyrinth (1986), David Bowie's face is hidden in several landscapes.
In Spider-Man: Homecoming, Bruce Banner's face is alongside the other "famous scientists" on the wall of Peter Parker's physics class.
At the end of Titanic, Rose is reliving everyone she met on the boat. When she gets to Jack, behind him there is a clock that reads 2:20, the exact time that the ship sank.