Plot hole: Level Five: After finishing the mission to defeat The Dirty Bubble atop the Sea Needle, the game completes, the Dirty Bubble is stopped and Bikini Bottom is saved from the little dirty bubbles infecting them. After saving the day, the game lets you go back to Bikini Bottom to finish off some other missions, but despite this the citizens are still infected by the little dirty bubbles and if you go back to the Sea Needle, the Dirty Bubble is still waiting there and reading to be battled again.
Plot hole: Level Four: Just after you finish defeating The Jumbo Shrimp, SpongeBob is back at Squidward's house telling him the story. Squidward tells SpongeBob that something is wrong with Gary and SpongeBob goes back over to the house to see what is wrong with him. SpongeBob finds out that Gary is hungry and attempts to go to Patrick to see what to get because they are out of pet food. This makes no sense because in level one earlier, SpongeBob opened up a pantry filled with pet food. There's no way they could have been out of food.
Chosen answer: The Kelp Forest was shown in the episode "Club SpongeBob".
Casual Person