Continuity mistake: When the bee sees Donald's eyes in front of him, you can see there is nothing behind him on the table he is walking on, but in the next shot a wooden box appears out of nowhere.
Continuity mistake: Donald uses four jars to take out the honey from the car radiator. But when he picks up the honey later on, there are now five jars.
Continuity mistake: When the bee puts his feet in the ink pad, he leaves a trail of footprints outside the greenhouse. But when he has his feet stuck on the fly paper and flies out of the greenhouse, the footprints are nowhere to be seen.