The episode where Kramer is in a department store with Elaine and sells the suit he's wearing to Bainya (sp?), Seinfeld's "friend" who always wants him to buy him dinner at Mindy's. Kramer is in a dressing stall with only his boxers on and a wallet tucked into the waist band of his boxers, talking to Seinfeld. A couple edits later, we see that the wallet has MYSTERIOUSLY vanished from Kramer's boxers! An obvious mistake by the continuity director, who should've spotted this before the shooting continued.