Star Wars (1977) originally had Red and Blue Squadron attacking the Death Star, but blue conflicted with the blue screens, so it was changed to gold. In Rogue One (2016), Red, Gold and Blue squadron attack Scarif, where Blue Squadron is destroyed, leaving them unavailable for the events in Star Wars
In The Social Network (2010), as Divya runs to the Winklevii, he goes up stairs and crosses a bridge just as a crew boat rows underneath it. It took so many takes to get the boat's timing right that by the time they got it, the actor playing Divya had run the stairs so many times, he was throwing up
