Teenage Egon sits at the breakfast table wearing a yellow shirt with a green collar. But in one close-up, his shirt is colored like his blue jumpsuit with pink collar.
At around the 17:06 mark, Winston, with his back to viewers, is miscolored with Ray's colors.
Egon initially claims that the Clock Ghost is "at least a class 5" but only moments later asks what happened to the "little class 4." No explanation is given for the discrepancy.