In the episode where Jack is Eric's boss at Pennbrook and Eric has to go to the bank to deposit the money and screws up I noticed a slipup. Before Eric goes from good-hearted to bad Mr. Feeny is looking at the sweatshirts. He has a navy blue one in his hand and not even a second later the view changes and Mr. Feeny walks up to the counter. He asks Eric what he thinks of the sweatshirt and it is a bright red sweatshirt!