A Lot of Band-Aids and the Cooper Surrender - S5-E13
Factual error: When George comes home from school, he opens the fridge to grab a beer. Visible in the fridge is a bottle of Gatorade with a modern-day label. (00:12:19)
A Suitcase Full of Cash and a Yellow Clown Car - S5-E16
Factual error: In the closing shot of this episode, a pile of cash is down close up. The bills are current circa 2000s and the show is set in the late eighties. The bills didn't have the current security markings that we have now.
Babies, Lies and a Resplendent Cannoli - S5-E18
Other mistake: Georgie tells Mandy he'll soon be 18, in March. That same day, Sheldon says Isaac Asimov died - which happened on April 6, 1992.
White Trash, Holy Rollers and Punching People - S5-E21
Factual error: When George Jr goes to the doctor's office with Mandy, when he walks in, you can see a modern Covid-19 safety poster behind his shoulder. (00:11:00)
Answer: Some people just have a dislike for someone that can't be explained. Could be as simple as the way he's dressed.