In the movie, ‘Liar Liar’, in the scene right after Jim crashes the ladder cart, there is a fire marshal named Bill who is played by Jim Carrey himself in the background. So he cameoed in his own movie.
Raul Julia's final role was the villainous M. Bison in "Street Fighter" (1994), which he filmed while dying from stomach cancer. He took the role because his children loved the franchise and he wanted to star in a film they could enjoy.
3Captain America: Civil War
In Captain America: Civil War (2016), the audience is silent during Tony Stark’s B.A.R.F. presentation. But in the flashback to that same scene in Spider-Man: Far From Home (2019), the audience is laughing, implying that Mysterio remembers this moment as a lot more humiliating than it actually was.
4The Truman Show
In the movie “The Truman Show”, Jim Carey’s best friend is a vending machine re-stocker. In one scene, when he runs out of candy bars to restock, he pulls the bars out, just so it looks like he’s still doing something. No one buys vending machine candies on a TV set, where food is free.
In ‘The Incredibles’, one scene has a clear reference to Die Hard 3, to the scene where a police officer points a gun at Samuel Jackson. Samuel Jackson played both Frozone and the policeman in ‘The Incredibles’.
In The Avengers, Robert Downey Jr. always hid snacks around the set for when he got hungry. One day, he randomly offered Chris Evans blueberries in the middle of a scene, and they kept it in.
During the 'Watchmen' (2009) opening credits, the original Nite Owl rescues Thomas and Martha Wayne from a mugger outside the Gotham Opera House, preventing the need for Bruce Wayne to become Batman in this universe.
In Megamind (2010), after Roxanne learns that Megamind has been lying to her and he insists that "I can explain," one of his famous "No You Can't" posters appears in the background.
In Schindler's List, the main road of the concentration camp is paved with tombstones.
In “Casino Royale” the iconic theme of the Bond franchise is not heard until the end of the film, finalizing his transformation into the MI6 agent we all know.