Character mistake: Tina Fey fumbles her line and has to start it again. The original line should have been "How long do you think you're going to get away with this? Hazel or Jenna will know we're missing." Instead the second part of the line is "Henna or Jay; Hazel or Jenna will know we're missing!" (00:04:05)
Character mistake: When Kyle is re-taking the test at the end of the school day, you see him bubble in 4 answer and turn the page and continue to answer questions. However there were 7 questions on the first page so he ended up putting the answer to #8 on #5 of the scantron. Kyle is too smart to do this.
Character mistake: When Dexter is looking up Travis Marshall on his laptop he mentions he lives at 1742 Vanderan Street, but on the licence details on screen the number reads 1026 Vanderan Street.
I Can't Make You Love Hannah If You Don't - S1-E4
Character mistake: When Olivia turns up at Jackson's house, she says, "That was my Saturday afternoon. This is my Saturday night!" which indicates it is the same day. But when Cooper arrives, he says, "Sorry for blowing off at you yesterday," which means another day has passed. However, at the Hannah concert, it is the same day all the while, so Cooper had got his days wrong.
Character mistake: Sam encounters Marc Bolan in the club and warns him to "drive carefully", aware of Bolan's future death in a 1977 car accident. However, Bolan never learned to drive and he was actually a passenger in the fatal accident. (00:07:55)
Dedication - S1-E7
Character mistake: When they show the helicopter containing Alpha team, it is a Bell 206 JetRanger, and the sound effects match it, but Brown says "This is the first time I'm on a Huey." The Huey and JetRanger look and sound nothing alike. (03:25:00)
God Is in the Details - S2-E10
Character mistake: When Diane quotes the scripture, she says "Revelations." However, it's just "Revelation." Someone as smart as her who has read the New Testament (or heard it quoted) would know the correct word.
Character mistake: When Betty and Daniel takes Oshie to the White Tassel, as they are walking in, Daniel asks Betty if she is sure that they do not have anything over $5, Betty smiles and agrees. However, when there is an establishing shot of the restaurant, it states in the window that there is something for $9.99.
Children of Earth: Day One - S3-E1
Character mistake: Lois says that Colonel Aduya's uniform "isn't British Army". In fact, it is entirely (and accurately) British Army with the exception of the small UNIT badge over the pocket.
Episode #5.6 - S5-E6
Character mistake: When Alice is releasing the cape vulture at Mara, she twice says "good boy" to the vulture, which means that the vulture is male. When she returns to Leopard's Den and tells Danny about the release, Alice says "Watching her flying away like that was amazing" which would mean that the vulture was female. (00:00:40)