In "Gym" when Moze is talking to Ned and Cookie arrives we see her close her locker, in the next shot, it's open again, and in the next one, it's once again closed.
In "Daydreaming", when Lisa gets caught while daydreaming she starts browsing in her book in panic, then tries to turn it around and throws her nasal spray off the table. In the next shot, the spray is back on the table and her book lies straight again (and she's still browsing in it).