American Beauty (1999) - 5 major mistakes

Visible crew/equipment: After he gets beaten up by his father, Ricky looks in the mirror. On the left edge you can see a bit of the camera, then it moves away.

Revealing: In the scene when Ricky's father rushes to his room and punches him, Ricky is bleeding before he is hit.

Continuity: After Lester throws the pillow, it bounces off the couch and lands in the chair. In the next shot it's gone, but reappears in the following shot.

Continuity: The interior layout of the Burnham's house does not match the exterior of the house. This is illustrated in the scene in which Jane comes inside after Ricky is taping her for the first time. She walks in the front door and goes directly into the dining room to peer out of one of the two side windows. If the interior of the house matched the exterior, she would not have been able to peer through those windows because they would not have existed. Instead, the garage would be there. (While there may be a window on that side of the dining room that does face out near the garage - extended external views of the house from that side are not plentiful in the film - there are still not two windows which face out in that direction. The garage would block one.)

Continuity: In the scene where Ricky's dad is driving him to school, if you look closely in the background, they drive by the same houses twice.