Stew-Roids - S7-E13
Continuity mistake: When Lois is talking to Meg on her bed she gets up and throws a book and a bottle of pills on the bed that came out of nowhere. The nightstand is out of view but if you look at the earlier scene there's nothing on the stand except a clock and a lamp.
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 ★