There's Something About Paulie - S2-E16
Continuity mistake: When Peter tells Lois he accidentally put a hit out on her after she sees Big Fat Tony dead in the newspaper, the paper is set on the table in front of Peter by a yellow box. During this conversation, the paper and the box keep disappearing or moving positions between shots over and over. Also, Peter's cup disappears in a couple of shots. (00:14:00)