Continuity mistake: The age difference between Chris, Meg and Stewie keeps changing throughout the series. At the beginning of the series, Chris is 13, Meg is 15 and Stewie is 1 (he is after S1 E3 Chitty Chitty Death Bang). In series 4, Chris then goes to high school so he must be 14 by that time. It isn't referenced that Meg has aged between series 1 and series 5 until S5 E10 Peter's Two Dads where she turns 17, so she must have turned 16 during the past five seasons. Despite Meg having aged two years throughout the series, Chris remains having only aged one year since S4 (Age 14 referenced in S9 E13 Trading Places). Then in S10 E10 Meg & Quagmire, Meg then turns 18, and still Chris hasn't aged. Also, Stewie remains one year old after all of Chris and Meg's birthdays. If it were consistent, Meg would be now 18, Chris would now be 16 (not 14) and Stewie would now be 4 (not 1).
Continuity mistake: In the episode with Peter dating a girl with a black hand, in one scene, we see Peter with the girl. After Peter leaves in the 3rd shot, the black on her right hand now appears on her left hand.
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 ★