When Toby is confronting Meredith about her dress, the clock reads 3:15, then a couple scenes later, when Ryan loses one of Dwight's former accounts, the clock reads 1:45.
When Michael lays down the scrabble pieces, they are uneven, then a couple seconds later they are seen lined up evenly.
When Jim is playing chess with Creed, Creed has two dark squared bishops - not one of each - and the chess board itself should have been rotated 90 degrees before setting up the pieces.
Michael meets with the sales staff in an entirely enclosed pallet fort in the warehouse. During the meeting, a warehouse worker uses a forklift to remove a pallet, opening the fort. If a forklift were necessary to close the fort from the outside, there is no way they could have gotten in.