Continuity mistake: Quagmire and Meg are sitting on the couch. From out of nowhere he gives Meg a gift for her birthday. He came over empty handed.
Other mistake: When Peter was rescuing the Fishmans he totally missed grabbing the woman's hand but she didn't fall. (00:19:50)
Chitty Chitty Death Bang - S1-E3
Revealing mistake: After the manager of the arcade takes money from other customers and cancels Stewie's reservation, Peter and Chris start walking along a row of arcade machines. Here the background was just copy and pasted over again, as they walk by the same place twice, and start a third time before the scene changes. (00:07:35)
I Never Met the Dead Man - S1-E2
Continuity mistake: At the stop light, Meg starts racing a guy on a horse drawn carriage. When they leave the light, they are going down a road by a cliff side, and suddenly there are no lines in the road from the side angle. When it cuts to the carriage's wheel coming off, suddenly there is a dotted yellow line in the road by it. (00:03:17)
Crimes and Meg's Demeanor - S16-E8
Continuity mistake: At the beginning of this episode Peter is talking to Meg about her senior year in high school. This makes no sense considering she turned 18 in season 10, which was released in 2012.
And Then There Were Fewer - S9-E1
Continuity mistake: When Muriel is killed in the flashback, she is on the floor with her arms open and head down. When they find her, her head is tilted and her arms are straight to her body.
Continuity mistake: When Cleveland and Peter are in his car making sandwiches, Peter originally makes one sandwich that he splits with Cleveland. When the two men approach the car, saying they smelled something good, they offer $10 a piece for a sandwich. Peter then hands them each a sandwich that he couldn't have made that quickly.
Continuity mistake: Meg comes in the kitchen and Peter pulls out her chair for her. Next shot of Meg shows a plate of food appear out of nowhere. Peter, Lois and Chris had a plate in front of them and there was no plate in front of Meg at any time. There was no other food in sight on the counter or stove either. (00:15:00)
Partial Terms of Endearment - S8-E21
Continuity mistake: In this episode, Lois is shown to have dated Naomi during college. But in the episode "Meet The Quagmires", it was established that Lois and Peter were already dating when Lois was eighteen. She accepted Peter's marriage proposal at that age. She would have been engaged and possibly married during college, not dating other people.
Other mistake: Lois goes to the bathroom at the bowling alley. There's only one way to the bathroom yet Quagmire beats her there and has time to hide in the stall. There's no way he could've done that considering he went after Lois.
The Thin White Line (1) - S3-E1
Other mistake: During the scene at the rehab clinic when Brian is jogging, Peter asks if he wants to go "mess with the pregnant teens across the lake." Brian says no because "Group therapy, two o'clock." However, the sky looks as if the sun is about to rise or just set. The time cannot be anywhere close to 2:00, neither AM nor PM.
Continuity mistake: Peter's boss tells him to put on his helmet. He reaches behind him and out of nowhere, a red helmet appears in his hand.
Factual error: Brian is sitting on the couch smoking weed. Joe knocks on the door and Brian just waves the smoke from the air. Joe is there to give Brian a drug test and says nothing about smelling weed in the air. There's no possible way he didn't smell it! You can't just wave your hand and get rid of the smell.
Other mistake: Throughout many episodes, it's discovered that anybody that touches Death immediately dies. When Stewie learns that Death has come for Peter, he immediately touches his finger to lead him inside but manages to live.
Continuity mistake: While cooking dinner, and waiting for Peter, Lois has a watch on. As she comes down the basement stairs, it's suddenly gone.
Other mistake: When the cut scene goes to Star Trek The Next Generation, all of the rank pips on the crew's collars can be seen on their left side. All Starfleet rank insignia, with the exception of Admirals in this series, is situated on the right side. (00:18:45)
Continuity mistake: During the flash back at the ice cream store Peter's eyes change in size twice before he licks the ice cream and then one more time after he licks the ice cream before falling down.
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.
The Most Interesting Man in the World - S12-E17
Continuity mistake: At the Clam, when Peter mentions it was smart to wait out the thunderstorm, it is the middle of the day, but when Peter runs out of the Clam to go find Stewie, about 45 seconds later, it is suddenly sunset. (00:03:50 - 00:04:35)
The Courtship of Stewie's Father - S4-E16
Character mistake: Lois takes a basket of clothes downstairs to wash them. But she puts them in the dryer instead of the washer.
