This one of the first times in a while for a character (squidward for this moment) to reference that the characters can't breathe air. Bubbles the magic dolphin gives them the power to breathe in this movie but in all other times they go on land (The SpongeBob SquarePants Movie (2004), for instance) they can just breathe it no problem.
As shown in the trailers, SpongeBob and the gang become super-heroes. What are their super-hero identities?
When they become super-heroes, their identities come to be known as, first being SpongeBob, who's known as The Invincibubble, Patrick as Mr. Superawesomeness, Squidward as Sour Note, Mr. Krabs as Sir Pinch-a-Lot, Sandy as The Rodent, and Plankton as Plank-Ton.