Blue Harvest - S6-E1
Continuity mistake: After Vader (Stewie) kills Obi-Wan, Luke yells out and then the shot shows storm troopers firing at him with Vader in the background. Vader's lightsaber is blue, when it should be red. It is red in the previous and next shots. (00:34:00)
Blue Harvest - S6-E1
Continuity mistake: When Obi-wan (Hebert) stars singing, Luke (Chris) is holding his stormtrooper helmet. About a quarter into the song, there is no sign of the helmet Luke was holding.
Blue Harvest - S6-E1
Other mistake: In the scene where the Millennium Falcon has just left the death star after Obi-Wan has been killed, there are two shots of the ship flying away through space. In the second shot, the cockpit is missing. (00:33:35)
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 ★