Economics of Marine Biology - S4-E7
Continuity mistake: A barber is adjusting Jeff's collar when Pierce begins to talk about the country clubs he belongs to. In the next shot, there are no hands touching Jeff's collar and in the shot after that, his collar is completely covered by the barber's cape, with no barber behind him anymore. (00:20:30)
Economics of Marine Biology - S4-E7
Audio problem: Coach Chapman makes his way up to the white board to introduce himself and the class topic. We hear him say "Welcome to P.E.E." but his mouth doesn't open at all.
Audio problem: Before Abed returns to the dance, he says to Rachel "Okay, bye, " and even though it is in a profile, his mouth movements don't match the words as it looks like he says more than that. (00:14:55)
Advanced Introduction to Finality - S4-E13
Continuity mistake: In episode 11 of Season 4, it was stated that Leonard got an A in 1968, then opted for pass/fail to have the highest GPA in the college. In the final scene of this episode, however, it shows Greendale college as being established in 1974.
Audio problem: Troy asks if he can be a surprise witness, and then says "Wait." We hear him say this, but don't see him open his mouth to say it. (00:19:10)
Basic Intergluteal Numismatics - S5-E3
Revealing mistake: When Annie and Jeff think to search people who like Dave Matthews Band, she gets on the computer and starts typing. But the characters that show on the screen and the way that she types do not sync up correctly. (00:08:50)
Analysis of Cork-Based Networking - S5-E6
Continuity mistake: As Professor Hickey is waiting on the janitor to finish his meal, he looks away towards the hallway. After the janitor speaks, the camera cuts and he is now looking directly at him. (00:03:05)
Analysis of Cork-Based Networking - S5-E6
Continuity mistake: Abed opens his locker to reveal Britta's spoiler sheet. It rolls open but it doesn't fold open to see what it says exactly, but two shots later it is now open fully. (00:05:30)
App Development and Condiments - S5-E8
Continuity mistake: There is a gavel with its handle facing inwards toward the table, facing away from Jeff. When the app developers begin their pitch, the handle of the gavel is now facing towards Jeff. (00:01:00)
App Development and Condiments - S5-E8
Continuity mistake: Professor Hickey is rolling up a newspaper in front of him, when the camera cuts away and then back, it is flat against the table. (00:02:00)
App Development and Condiments - S5-E8
Continuity mistake: Jeff is doing stand-up comedy with a mic stand an a stool with a bottle of water on it behind him. A few shots later, without touching them or anyone moving them, they all completely vanish. (00:12:55)
Continuity mistake: Chang's sunglasses are sitting on the table in front of Professor Hickey and Shirley. When Richie sits down, the sunglasses have disappeared. (00:10:10)
Continuity mistake: Britta sets down a tray with a sandwich on it horizontally right in front of her. In the next shot, it has now moved further away from her and is sitting vertically. (00:12:05)
Lawnmower Maintenance & Postnatal Care - S6-E2
Other mistake: Britta hits Abed in the face with a pillow, swinging in from the right, but when it connects, his face swings the other way, the same direction from which the pillow came. (00:16:50)
Lawnmower Maintenance & Postnatal Care - S6-E2
Continuity mistake: Britta is running out of her parents' house, leaving the door behind her closing. In the next shot, the door has stopped moving and is opened up more. (00:16:55)
Lawnmower Maintenance & Postnatal Care - S6-E2
Continuity mistake: Elroy is holding the Dean in virtual reality. In real life, his hand is in front of his face and slightly opened. When the camera cuts closer, his hand is lower and clenched in a tight fist. (00:21:00)
Basic Crisis Room Decorum - S6-E3
Continuity mistake: Chang is holding a piece of paper by the top, showing it to everybody. In the next shot, he is holding it by the side. (00:04:15)
Basic Crisis Room Decorum - S6-E3
Visible crew/equipment: While Chang is reading the message about the attack ad, you can see a very visible camera used to film Winger.
Queer Studies & Advanced Waxing - S6-E4
Audio problem: Elroy walks into the study room complaining about Donkey Kong stealing his idea. We hear him say they made "the eggs into barrels" but his mouth makes completely different movements. (00:00:55)
Queer Studies & Advanced Waxing - S6-E4
Continuity mistake: At one point earlier in the episode, Elroy mentions that there are two baby birds in the nest that needs to be moved. Later, after the nest is moved, Abed mentions that there are three baby birds - two died and one survived.
Answer: His attempt to "kill" Jeff was to roll at him as an iPad on a stick. He knew it wouldn't work, but it played to the story that he was a killer as he knew Jeff would tell people about it, or attempt to retaliate for it.