Back To The Future - Video Tape
When Doc is caught watching Marty's Videotape back in 1955 the footage starts of Doc saying "Never mind that now, Never mind that now". The thing is when Marty is filming Doc in 1985, he never films Doc saying this. Even if for some reason the camera is on, it is clearly pointing at the ground, and when Doc watches the tape he sees himself saying it.
on 05-02-2001 and