Plot hole: They're in the Clam complaining that they can't drink when they make the revelation that Brian can because he's technically 56. But Quagmire should be able to drink, as in a much earlier episode, he's revealed to be over 60.
Suggested correction: Quagmire considers the rest of them to be his best friends. He isn't drinking because they can't drink. He is complaining because since his friends can't drink - he won't drink, so he is still pissed.
It's still a plot hole considering Quagmire's age. I think the writers messed up big time.
You make a good point, but it's awkward to be that one person who is drinking while surrounded by people who can't. So, I understand the correction that was submitted above. Because his friends are not drinking, he now feels that he can't.
Mr. Griffin Goes to Washington - S3-E3
Continuity mistake: When Mr. Weed is crying about losing his job, we see a view of a long line of trees in the window behind him. The camera switches to a close-up of Peter. When it zooms out again, the trees on the right of Mr. Weed are missing.
Suggested correction: I watched this part of the episode twice and no trees are missing in the window behind Mr. Weed after the close-up on Peter. Actually, Mr. Weed's head is covering part of the window where you can't see the trees on the right when he's lying on the table, but when he gets up you can see all the trees.
Continuity mistake: During the scene where Chris walks into a hardware store, the antennae on the control on the back of his head change from straight to curled to straight again.
Suggested correction: I watched the hardware store scene carefully but I didn't see any difference on the format of the antenna on Chris' head. It's always stay curled in the whole scene.
I Am Peter, Hear Me Roar - S2-E8
Revealing mistake: When Brian says "Well face it Peter, your attitude towards women isn't exactly enlightened", Brian's dog tag is the same color as his fur. It also stays still, even while Brian is moving his head. (00:11:10)
Herpe, the Love Sore - S12-E16
Factual error: Stewie could not have gotten herpes by blood - it's only transmitted by infected saliva or skin.
Suggested correction: Please tell me that you are not a doctor! The two types of herpes viruses, HSV1 and HSV2 can be transmitted in blood as well as saliva. Such transmission is very rare as the virus deactivates rapidly in stored blood, but it is incorrect to say that it cannot happen.
The Cleveland-Loretta Quagmire - S4-E5
Plot hole: Brian and Peter see Loretta and Quagmire having sex yet, they aren't sure who she's having an affair with. There's no way they couldn't have noticed it was Quagmire - the couch was facing the front door! And obviously Quagmire was on top of Loretta considering the fact that he leans up, says something, then she tells him to get back down here and finish.
Tales of a Third Grade Nothing - S7-E6
Other mistake: In the cutaway at Ford's Theater, Abraham Lincoln receives a cell phone call from someone who is implied to be Thomas Jefferson. While the anachronism of a cell phone in the Civil War can be ignored as humorously deliberate, Lincoln can't be talking to Jefferson; by April of 1865, when Lincoln was assassinated, Jefferson had been dead for nearly 40 years.
Suggested correction: Where are you getting the implication that it is Thomas Jefferson? You seem to have misunderstood the joke. "I hear you took that black chick home. You're welcome." is not a reference to Jefferson sleeping with one of his slaves. It's simply a reference to Lincoln freeing the slaves. Tom is just a generic name. (Besides, if you're complaining about historical anachronisms in Family Guy cutaways, you're probably missing the point.)
I concede that it's a bit of an assumption, but can you really fault me for making it? Yes, Thomas and its derivations can be common given names, but off the top of my head, I can't think of any from Lincoln's era famous enough for casual viewers to automatically make that assumption.
Conversely, since the allegations about Jefferson and Sally Hemings have endured for 220 years, Occam's Razor suggests it's the first thing probably 99% of us would immediately think of upon hearing "Thomas" and "black chick." And I have no problem with the historical anachronism of Lincoln owning a cell phone. Believe me, I get the joke; his obnoxious behaviour is why Booth shot him, and cell phones are so ubiquitous, it's something we in the 21st century can relate to.
The issue I have is of a factual nature. Even for an animated sitcom, there are certain tenets of reality that I think must be adhered to if a joke is going to be set in a specific time period, two of which are the passage of time and the finality of death. For the sake of argument, humor me and assume that it is Jefferson; it is well-documented historical fact that Jefferson died on July 4, 1826, the 50-year anniversary of the Declaration of Independence's adoption.
The reason why it's so well-documented is because, in one of the biggest coincidences in American politics, John Adams, a political frenemy of Jefferson's, and under whom he served as vice president, also died that day. My argument is that, given the limited context of the scene, under an assumption that 99% of us would make, the Thomas calling Lincoln can't be who it's implied to be, because who it's implied to be had been dead for nearly four decades.
Except Thomas Jefferson wasn't from Lincoln's era. You say yourself he had died almost 40 years earlier. This error seems to boil down to, "I'm going to assume that it is a Thomas Jefferson reference. I'm also going to assume that everyone else will see it that way. And that the producers didn't realise Jefferson was dead at the time. Therefore, it is an error based on my unfounded assumptions."
Other mistake: When the family is driving to New York, another red car passes in front of them from the right where there is no road. (00:09:35)
Suggested correction: Usually this would be right, but it's evident by their positioning that Peter is actually driving his car right in the middle of the road on the dotted line and not staying in one lane. This is why the truck passes on the left to get in front and then the car on the right, both also getting centered on the dotted line.
Continuity mistake: The gun in Peter's first cutaway vanishes when the stage goes dark.
Factual error: Joe's plan to trick OJ into confessing to the 1994 murders is moot since, having been acquitted, the double jeopardy provision would prevent him from being tried for the same crime twice, and as a cop, Joe would know that.
Suggested correction: The plan to get OJ to confess had nothing to do with getting the confession, so he could be arrested or tried again. And at this point, the civil trial already found OJ "responsible" for the murders. Since OJ has always maintained his innocence, getting a confession on tape would just be big news.
Other mistake: When Peter was rescuing the Fishmans he totally missed grabbing the woman's hand but she didn't fall. (00:19:50)
Plot hole: Peter and Lois board the cruise ship without any luggage.
Suggested correction: All luggage is loaded separately just like an airport.
Continuity mistake: All the army men including Brian and Stewie have USA symbols on their arms, but when Stewie and Brian talk to one of them, after they shoot each other in the foot, the USA symbol on the man's sleeve is orange lines and a arrow.
