The Psychology of Letting Go - S2-E3
Continuity mistake: When Professor Duncan comes into the classroom, he circles and underlines "anthropology." When Chang walks in, the circle and underline change drastically. It goes back to the original way in various shots.
The Psychology of Letting Go - S2-E3
Continuity mistake: The amount of the black oil stuff that covers Annie when it spills on her increases in the next shot of her, before she and Britta start fighting.
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.