Over the Moat Button Abuse
In the goo beside the huge sand castle in Goo Lagoon, there is a toll clam. Patrick can pay this clam, which spawns a button in the goo. Throwing a melon at the button raises the Over the Moat spatula from under the goo, along with a path leading to it.
It turns out that the button is invisible and active the whole time. SpongeBob's bubble bowl and cruise bubble can also activate this button. By aiming at the invisible button, this skips paying the clam.