In the scene where Fletcher is beating himself up in the bathroom. He throws himself into the what looks like a marble wall and the wall moves. Marble doesn't move like that.
Auctually, marble CAN move like that. You see, movies are made on this thing called a "Set". The marble is part of the set, the wall can move on its own, so when Fletcher hit the marble, he hit the wall, causing it to move.
Well, DaYs, last time I checked, when you run into a wall, it DOESN'T move. And people kinda AREN'T supposed to know that it's a set. It's a movie. Definitely a slipup. Good job.