Gettysburg - S8-E8
Continuity mistake: While Andy continues the tour, Gabe stays behind to perform as Abraham Lincoln. Later on we see Gabe with the others, we even get a close up. A while later, when everyone is tired and sitting on the grass, Gabe doesn't seem to be there. Eventually the episode ends with Gabe finishing his performance.
Branch Wars - S4-E6
Continuity mistake: Earlier in the show we see Michael trying to get Jim to go on a "sale" to crush Utica by pumping him up in the conference room and when he turns to leave he sees Toby in an orange bow tie for The Meeting of the Finer Things Club but later in the episode we see Toby wearing a greenish/brown tie. (00:07:00 - 00:11:00)
Continuity mistake: Michael and Dwight arrive at Wallace's house and discover that Michael is dressed like the servants, so they choose to exchange shirts. Behind the catering van, Michael removes his jacket and throws it on Dwight's shoulder, who grabs it and puts it between his legs. The frame switches from front to side, showing Michael removing his tie and hanging it on the van's mirror. When the frame goes back to front, Michael is shown still with his tie on, and throwing the jacket again, missing Dwight. (00:05:41)
Continuity mistake: In the episode's intro, as Dwight's aunt died, he explains the Schrute custom of inviting someone or not, by throwing red dirt or black soil at the person's face. In the first shot, Dwight shows the red dirt bucket by lifting his left hand, but when the camera angle changes to the side, you can see his right hand is lifted up with the other bucket. The camera returns to the front as he is still lowering his left arm, and then he proceeds to lift the black soil bucket with the right arm. (00:00:48)
Happy Hour - S6-E20
Continuity mistake: When Michael is doing press-ups Angela is sat, then she stands to see what's going on - away from her chair, it cuts to another shot, and she is sat down again.
Continuity mistake: When Dwight goes to write the idea that Erin had of a coat check on the whiteboard, he begins to write cop, but in the next cut, the P is changed to an A for coat check. (00:09:40)
Continuity mistake: As Creed is catching the football, he drops a folder he had in hand into his lap. In the next shot, the folder is gone. (00:00:45)
Continuity mistake: They take a pledge to "We all drink them all" referring to the espresso flavors. Angela puts her hand on top of the pile and it flips between Oscar's hand and Stanley's hand under hers depending on the camera angle.
Continuity mistake: When Michael begins the conversation with Jo, the door behind him is closed. After a few lines, the door is open. (00:19:10)
Launch Party - S4-E3
Continuity mistake: The way the numbers on the sales board are written by Andy change in between shots. (For example, the "305" is written differently, but still "305"; not that it becomes a "380" when Andy changes the number).
Continuity mistake: When the group is chanting, the first shot of the balloon has the forklift prong over it. In the next shot, Daryl is driving the forklift towards the balloon and the prong isn't over the balloon yet.
Tallahassee - S8-E15
Continuity mistake: When Dwight is holding the "Taboo" buzzer in front of Erin, he's holding it so the speaker is facing down. After Jim slaps him, he's holding the buzzer so the speaker is facing up.
Continuity mistake: When Jim and Michael are in the conference room with Jo, Michael messes up Jim's hair. A few shots of Jim later, his hair is nicely combed again.
Continuity mistake: When Angela is listening to Ben Franklin talk about flying his kite, her drink is near her lap, but in the next shot she's taking a sip from it.
Suggested correction: Michael didn't establish the contract with Hammer-mill. Rather, he locked them up as an exclusive supplier. It's unknown if they were already selling the products to Dunder Mifflin alongside Staples and Office Max.
Wrong, Josh says they cannot sell Hammer-mill products as they are exclusive to Staples so therefore they wouldn't have been able to sell there products alongside as mentioned before until Michael made them an exclusive to them solely, Dunder Mifflin. Therefore the original mistake stands true.