We see Jon Voight bite Kramer (Michael Richards) in the wrist area, but later on Kramer shows George his elbow.
When everyone is watching the Woody Woodpecker balloon float by, it is night time. In the footage of the balloon deflating, it is clearly day.
George states that the car is an '89 LeBaron, but the version he is driving couldn't be any newer than a 1986 model.
Jerry (Jerry Seinfeld) is already holding his shoes as he enters his apartment with George (Jason Alexander), before he steps in the gum. Response: Jerry is holding his shoes after he steps in gum, not before.