Revealing mistake: We see George hit some trash cans while driving, then a while later later he hits some different ones. However the clip we see the second time is the first clip, reused.
A Musty Crypt and a Stick to Pee On - S4-E5
Revealing mistake: When Georgie is imagining what it's like to be a father Jana is shown holding two babies in her arms. You can tell that the babies aren't real they are just dolls.
Answer: Some people just have a dislike for someone that can't be explained. Could be as simple as the way he's dressed.