Continuity mistake: While Michael is introducing Ryan to Dwight and the stapler-in-jello is found, we see that Phyllis' chair is empty. Then a moment later there's a shot of her looking at Jim while sitting in her chair with no time to get there. And then the chair's empty when shown again. (00:15:25)
Continuity mistake: When the Dunder Mifflin lawyer says "she thought it had to do with her recent breast enhancement surgery," the woman on the right side of the screen has her hand on her forehead. Then the shot changes angles and the woman's hand is now resting on her chin. (00:08:45)
Lecture Circuit: Part 2 - S5-E15
Continuity mistake: When Jim and Dwight are talking about the activities for Kelly's party, Dwight is attempting (horribly) to blow up a silver balloon. Just after Jim finishes reading The List of proposed activities, Dwight says, "You're right, forget horse hunting, it's stupid." Immediately after he says this, the shot changes and he is now holding a brown balloon. (00:16:30)
Continuity mistake: Nellie and Pam are driving along, discussing what to make up about people's ancestry. Here, we see the same background go past Pam, a driveway with a black SUV on the right, and a white SUV on the left. This shot is only repeated in the angle where we can only see Pam, and the view out of the passenger side window. The car is driving along as normal, we see the two cars on the driveway, and then the car turns a corner, and we see the same shot all over again. (00:13:15)
Baby Shower - S5-E3
Continuity mistake: When Jan lets Michael finally hold Astrid, she has a pacifier. When Michael gives her to Phyllis, Astrid's pacifier is gone.
Continuity mistake: After everyone but Dwight and Kelly exit the building (because of The Fire), Dwight picks up the water jug and accidentally knocks over the blue cups next to it. A few cups fall to the floor but one remains still on the printer (next to where the jug was). After Dwight gets Kelly out of the kitchen, the blue cup has disappeared from the printer. (00:04:20)
Double Date - S6-E8
Continuity mistake: In Fun Run (4-1) when Michael hits Meredith in the parking lot, it is said by him that it was on company property, but in this episode Pam says that the hit in the parking lot will be off company property.
Continuity mistake: Near the end of the episode when Robert California is escorting Erin out of the office, they are already in the parking lot speaking while it cuts to a shot of a concerned Andy in the conference room watching them from the window. A few moments later, Andy is shown saying goodbye to his girlfriend, while watching Robert and Erin leave the office. This should not be possible as they were shown to be in the parking lot already in a previous scene, with Andy watching as well. (00:18:38)
The Alliance - S1-E4
Continuity mistake: Jim writes in Meredith's birthday card that she is an accountant, but later in the series it's said that she's a customer relations rep instead.
Continuity mistake: When Gabe and Erin are talking in the bathroom, Creed comes out of the stall and closes the stall door behind him, and it stays in that position. The next time we see the door, it's wide open.
Continuity mistake: When Dwight is talking to the kids, he picks up one fry. In the shot of him from behind, he's holding two fries. It goes back to one fry when he takes a bite.
Continuity mistake: When Kevin is writing Pam a check, he flips it open so the check register is folded under the checks. After he says "wait till Monday", the check register is no longer folded under the checks.
Health Care - S1-E3
Continuity mistake: When Michael is calling the coal mine, from outside the car he has his seatbelt on. But inside the car, he doesn't.
The Alliance - S1-E4
Continuity mistake: Dwight is hiding in a box in the basement when Pam comes down to the basement and pretends to make a secretive phone call. As she does so the box that Dwight is hiding in changes position on the floor, presumably so that the camera can catch the holes that Dwight has made in the box in order to breathe.
Basketball - S1-E5
Continuity mistake: During the Basketball game just before Pam throws the jump ball, Stanley is seen standing over Pam's left shoulder. After she tosses the ball up Michael hits the ball mid-air over to Stanley who is now about 10-15 feet in front of Pam, with no time to logically get there between shots. (00:13:15)
Continuity mistake: During season 1, specifically episode six, it is shown that the show is filmed in a real office building. The windows we see in Michael's office and the conference room match the exterior windows as they all walk to their cars at the end of the episode. However from season 2 onwards the office is at ‘1725 Slough Avenue', featuring the building everyone's familiar with. However if you look at the windows on this building they do not at all match the set interior, they even have vertical blinds that are visible. A large set error they ignored when moving to the replica set.
Continuity mistake: When Jim reveals the tiny desk underneath his "Quad-Desk" to Dwight, Dwight sets his briefcase down on a chair not shown in any previous shot. (00:21:05)
Continuity mistake: The dancer is eating some M&M's on Pam's desk. In one shot, there are some M&M's on the table in front of Pam. In the next, they are missing.
Continuity mistake: When Meredith's hair catches fire, we never see her face (as it's a stunt double). After Dwight uses The Fire extinguisher on her, the shot cuts (although she is still in the frame) and her hair is different, as it is now the original actor that plays Meredith. (00:05:50)
Continuity mistake: When they're having the Diversity Day meeting Jim's chair can be seen over Michael's shoulder several times. In the beginning of The Meeting the chair is pointed towards his desk, but when Kevin says that he remembers the Chris Rock routine and begins to recite it, you can now see that the chair is pointed towards Pam's desk; however no one has left The Meeting in that time. (The only person who's not in The Meeting is Devon. He was at his desk and walking around a few times but it makes no sense that he would go and move Jim's chair.) It's obvious that the actor left the chair in different positions during different takes. (00:06:00 - 00:07:05)
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.