Padding: The duet between Mr. Krabs and SpongeBob, while incredibly sweet, was clearly put in just to make the episode long enough.
Tear Jerker: Silly as it may be, this is one of the only times we ever see how much SpongeBob and Mr. Krabs truly value their relationship, and Plankton forcibly separating them is played so surprisingly straight that it's heartbreaking.
Frankendoodle:
Crosses the Line Twice: DoodleBob beating the crap out of Squidward? Horrifying for sure if you're SpongeBob and Patrick... Well, maybe not Patrick. But from the audience's perspective, it's so sudden and out of nowhere that it comes back to being funny as things quickly go to Hell from there.
Fridge Brilliance: Why can a live-action pencil bring drawings to life in a cartoon world? Because that's exactly how animation works!
While you can't magically bring drawings to life, the scenes of SpongeBob drawing a diving board and refurbishing his bedroom could probably be achieved now with a 3D pen.
"Take it easy, it's just a drawing."Explanation Patrick's relaxed response to SpongeBob's over-the-top celebration after (seemingly) erasing DoodleBob. A screencap of the line became a popular reaction image online, typically used in response to perceived overblown reactions to people's art or animated works.
"SpongeBob, you're gonna pay for that!"Explanation During the early days of YouTube, it was a common trend to edit Squidward being hit in the head with the Magic Pencil with other characters, typically political figures or anime characters.