This episode could be considered a look at the relationship between the artist and his creations, more further explored in The Singing Detective and The Tempest.

After the dollar joke, SpongeBob and Patrick were bouncing and stopped in midair, but then they were on the ground.

The rule of the artist at sea number 2: Always bring a pencil sharpener. He grabs it and continues drawing, but the lead snaps. The pencil is propelled back to the artist. He is finally trapped inside a book (he sticks to paper), and the page is framed on a wall. DoodleBob sharpens his half, so he has an eraser and a pencil. The pencil is snapped in half (DoodleBob has the eraser and SpongeBob has the pencil), then SpongeBob presumes that they both have equal power. However, the arm is still there, and in the night, it steals the pencil and draws itself. DoodleBob wreaks havoc (he steals the magic pencil) until SpongeBob erases him (the eraser end of the pencil is capable of erasing anything, not just drawings). SpongeBob then draws DoodleBob, a sketch version of himself. They realize that it's a magic pencil, and wreak havoc on poor Squidward. SpongeBob draws a jellyfish, then it comes alive. SpongeBob and Patrick are playing 'Rock, Paper, Scissors' using bubbles, when the pencil shoots down like a missile and slams on the ground, making a small crater.

The rule of the artist at sea number 1: Always bring a spare pencil. At sea, an artist is drawing a sketch, when he accidentally drops his pencil into the sea.

Doodlebob and the magic pencil ost