Continuity mistake: When Opie surprises Andy by telling him that he wants to take piano lessons with Clara, he heads to the piano to play what he already knows, and when Opie plays Chopsticks on the piano he's wearing a different shirt.
Continuity mistake: Wilma opens the bedroom door to find Fred covered in flour, but in the next shot the bedroom door has vanished while Fred stands in the doorway.
Continuity mistake: In the programme shown on 11 June 2007, David Platt takes his exam and then sets fire to his exam paper. In the programme on 22 August 2007, he collects his result and gets an A. He could not possibly have got an A, as he set fire to his paper.
Like This It Means Father... Like This - Bitter... Like This - Tiger... - S4-E15
Continuity mistake: The bruise on Wilcox's cheek switches from the right side of his face to the left and back again several times throughout the episode.
Continuity mistake: The packages Drake and Kathy place on the table beside their coats have disappeared when they return for the coats a few shots later. (00:19:00 - 00:21:20)
Continuity mistake: In all other episodes of this season, Officer Dan has blonde hair. This one episode, Officer Dan has gray hair and his face looks completely different from other episodes.
Continuity mistake: In the episode "Malice in the Palace", Larry drops a hot dog after plating them, and never notices. After setting the cat up with a hot dog, the one on the floor, along with the small amount of water, has disappeared.