When Momma Krabs tells her son to go to his room, her lavender hair is missing.
After SpongeBob scolds Gary for letting Snelly take the lead in the race, Patrick is shown talking to Rocky. However, he was nowhere to be seen in the previous shot in spite of Rocky itself being in plain sight.
Mr. Krabs clearly should have recognized his own mother's house as soon as he arrived.
In "The Great Snail Race", Patrick reads "Property of Squidward Tentpoles" off of Snelly's pedigree paper despite the paper itself reading "owned by".