1. According to IMDB, Robert Redford messed up at the very end of this six-minute-long continuous scene from All the President's Men . He accidentally calls the man his character Bob is speaking to on the phone with — Dahlberg — "McGregor." (This is the man his character was on the phone with earlier in the scene). Given the mistake would require the entire six minutes to be reshot, Redford quickly corrects himself and stays in character, playing it off as if Bob has actually gotten the name wrong. It works because Redford's character is so flustered in the moment, and his mistake seems natural. 2. Donald Glover revealed to Conan O'Brien that the scene in which his character slips in The Martian was an accident. "I get up, and I, like, just eat it, like, I slipped so hard," Glover told Conan. He said everyone gasped, but he kept going with the scene. "After the scene's done, [director Ridley Scott] comes up and he's like, 'That was great,'" Glover continued .…