The Snowball Effect / One Krabs Trash - S3-E3
Corrected entry: How does Squidward get to the top of his snow fort if there's no stairs on the inside of it, not fall inside the snow fort without holding on? How does it snow underwater, and where did that big tree come from?
Correction: IT'S A CARTOON! Some suspension of disbelief is expected. Sea creatures don't talk or wear clothes either.