When Elaine is talking to Joyce in the health club, Elaine grabs her and Joyce's jacket comes down off of her left shoulder. In the next few shots, the jacket is back on her shoulder and back off of her shoulder.
Jerry remarks to his mother that he's watching "Tiny Toons" on Nickelodeon. "Tiny Toon Adventures" didn't begin airing on Nickelodeon until 1995, whereas "The Contest" first aired in late 1992. Looney Tunes did air on Nickelodeon in 1992, however.
George says his parents were supposed to be at work when his mother caught him. However in the hospital Estelle says she went out for a quart of milk and caught him when she came back.
When Jerry and Marla are making out on the couch someone walks past the bathroom window.