When Farrow was reluctant to film a scene that depicted a dazed and preoccupied Rosemary wandering into the middle of a Manhattan street into oncoming traffic, Polanski pointed to her pregnancy padding and reassured her, “no one’s going to hit a pregnant woman”. The scene was successfully shot with Farrow walking into real traffic and Polanski following, operating the hand-held camera since he was the only one willing to do it.
"Every great magic trick consists of three parts or acts. The first part is called The Pledge.The magician shows you something ordinary: a deck of cards, a bird or a man. He shows you this object. Perhaps he asks you to inspect it to see if it is indeed real, unaltered, normal. But of course… it probably isn’t. The second act is called The Turn. The magician takes the ordinary something and makes it do something extraordinary. Now you’re looking for the secret… but you won’t find it, because of course you’re not really looking. You don’t really want to know. You want to be fooled. But you wouldn’t clap yet. Because making something disappear isn’t enough; you have to bring it back. That’s why every magic trick has a third act, the hardest part, the part we call The Prestige.”
When Aragorn, Legolas and Gimli run up to search the burnt orc corpses for Merry and Pippin in Rohan, Aragorn kicks the metal Orc helmet on the ground. This particular bit was reshot several times and it is the last take they show in the film because Aragorn’s scream and following sigh are so realistic. Well, that is because Viggo Mortensen actually broke two of his toes, when he kicked the helmet so hard in that take.