Revealing mistake: In the scene where King Arthur expounds on the joy of his kingdom, he has a Band-Aid on the back of his neck. (00:21:00)
Visible crew/equipment: During the scuffle at the church between Benjamin and Mr. Robinson on the stairs, you can see the shadow of the camera on the wall on the left side of the screen. (01:43:17)
Revealing mistake: When they leave the studio to get into the taxi, there are multiple onlookers in the shot watching the scene from across the street. (00:06:00)