SpongeBob claims that Krabby Patties need to be eaten fresh. Why is there a need for a Patty Vault then?
Squidward claims that he has never tasted a Krabby Patty. He did, however, eat some Krabby Patties in "Your Shoe's Untied", which aired a year before "Just One Bite".
When Squidward sneaks to the Krusty Krab, he tiptoes past SpongeBob's house. Usually, the Krusty Krab is the other way, so Squidward should be going past Patrick's house.