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: When Fred has a nightmare he drops his pillow on the floor, and just as Wilma gets out of bed to pick it up, Wilma's pillow simply vanishes into thin air mid-shot. (00:13:50)
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: "Rusty Romeos," a 1957 short co-starring Joe Besser, is a remake of "Corny Casanovas," a 1952 short co-starring Shemp Howard. In a scene using stock footage from the earlier film, Moe and Larry are fighting, and a framed photo of Shemp is on a small table next to the couch. In the following scene, using new footage, the photo is of Joe. (00:15:10)
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.