Clint Eastwoods first movie was a sequel to Creature from the Black Lagoon.
In Terminator 2 Judgement Day, in the scene where they took the chip out of Arnolds head for maintenence they setup a fake mirror. They used Linda Hamiltons twin sister standing behind Arnold to mimic Linda who was behind a fake head that she pulled the chip out of.
They got Harrison Ford to be Indianna Jones after Tom Sellic could not get permission to film because it interfered with the filming of Magnum P. I.
Because the post-production for Apocalypse Now took so long & Martin Sheen had already begun work on another movie, Sheen's older brother--Joe Estevez--whose voice sounds nearly identical to Martin was brought in to do much of the voice over work for the movie.
Ghandi was one of the final 3 actors to be chosen for the part of Ghandi in "Ghandi". He was beaten out by Ben Kingsley who according to director Richard Attenborough "was more real".
Rex Kwan Do and Peter Gibbon's next-door neighbor are the same guy.
Cameron Frye is supposed to be 17, but the actor was actually 29 years old.
In The Man With Two Brains, Steve Martin plays a character whose last name is pronounced "Hoff-HARR", and the last line of the jibberish Steve Martin utters to summon the invisible swordsman in Three Amigos is hoff-HARR.
In Man of the House (not the UT cheerleaders movie), Tim Allen's character's son says to his dad "I once had a squirrel named Numbnuts." In Wild Hogs, Tim Allen's character uses numbnuts as an insult.