
Continuity mistake: When Stewie keeps saying "mum", he's not stood next to a rug. When the shot changes, a blue rug has appeared next to Stewie. (00:11:40)

Continuity mistake: When Peter says about suing Dr. Hartman, Lois is holding Stewie who is asleep and facing Peter. When the shot changes, Stewie is now looking towards Brian. (00:08:20)

Continuity mistake: When Peter is playing with Stewie's nose, Stewie's arms are by his side, but when the shot changes, he's got his arms in front of him. (00:08:10)

Continuity mistake: When Lois is talking to Brian about having homicidal thoughts, the rug colours swap order. (00:14:20)
Continuity mistake: At the start, Chris' hat is all yellow instead of yellow and black. (00:00:30)

Continuity mistake: When Lois is carrying Stewie down the stairs, the brick patterns in the wall change between the wide shot and the close-ups. (00:14:10)
Answer: Lacey Chabert was the actress who originally voiced Meg in early episodes. She left of her own accord due to being in school and other acting work; Seth MacFarlane has stated there was no tension with her leaving, but it makes for a handy joke for the show.
Jon Sandys ★