The straw in Jack Klompus's Diet Pepsi disappears in the middle of his embezzlement accusation against Morty.
When Kramer drops his groceries in the chase the pineapple comes to rest prominently at the front. In the next shot, head on, it has disappeared.
Jerry leaves his napkin wadded up on the coffee table when he answers the door for the cable guy. The napkin has disappeared when he gets back to the couch.
At the board meeting in part 1, there is a second white styrofoam cup that appears on the table then disappears and reappears again with a writing pad and pencil next to it that was not there before.
When Kramer is carrying his groceries, he is eating a candy bar in his left hand. However, when he is cut off by the cable guy in the van, the candy bar is gone from his hand.
Kramer is wearing white socks when he is being chased by the Plaza Cable guy. But when the very noticeable Kramer stunt double is being used around the city and rooftops, the stunt double is wearing black socks.
When Kramer drops his groceries, the sound of George yelling is heard.