1. According to Cary Elwes' book about the making of The Princess Bride, in the scene where Count Rugen knocks Westley unconscious, Christopher Guest hit him so hard that he actually passed out and had to be taken to the emergency room.
2. According to the documentary I Am Heath Ledger, the real reason Heath Ledger licked his lips so much as the Joker in _The Dark Knight _was to keep his makeup from coming off.
5. For their fight scene in Troy, Brad Pitt and Eric Bana agreed to pay each other for each time they accidentally hurt the other — Pitt had to pay $750, while Bana had to pay $200.
7. In Baby Driver, director Edgar Wright wanted to use Michael Myers masks, but couldn't get the rights — so he used masks of actor Mike Myers' face instead.
8. After Michael Cera told Rihanna he was going to slap her butt for real in This Is the End, Rihanna said she would slap his face for real too. After six takes, he said he didn't think he could do another.
9. Costume designer Penny Rose revealed that she had to start making Johnny Depp's pirate hats out of rubber after he kept throwing the leather ones overboard in Pirates of the Caribbean: The Curse of the Black Pearl.
12. The people in the Italian market during the training scene in Rocky_ _also didn't know a movie was being filmed, and someone just happened to toss Sylvester an orange as he was running, which he happened to catch — and the take ended up in the film.
13.Jim Carrey often method acts, meaning he's in character even when he's not filming. In fact, he once took an entire phone call to discuss How the Grinch Stole Christmas (his next role) while in character as Andy Kaufman in Man on the Moon. Ron Howard just went along with it.
15.In fact, McKellen was asked if he would take on the role of Dumbledore after Harris died, and he said yes — though they never followed up. According to McKellen, Harris told him before he died that he thought McKellen was a "rubbish" actor.