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The design of the car is based on a 1959 model Cadillac Eldorado, and possibly influenced by the GM Oldsmobile. The boat is a regular-sized boat mobile with many superhero features to it, such as the "origami button," which folds the boat mobile and the people inside into an origami shape. SpongeBob claims to know lots about the boat (knowing where the windshield wipers are, for instance), but pressed the aforementioned button.
The boatmobile has a more powerful engine than normal boats to enable the heroes to get to the situation where their help is needed faster. In addition to the engine, the boat mobile has manual transmission and a "torpedo mode" ejection system.
When using the Invisible Boat alarm, the boat mobile is fleetingly visible and revealed to be a beat-up pink Cadillac convertible. However, when SpongeBob and Patrick paint half of the Boat mobile, or when they run it into a street light, it appears to be shaped like a boat. Also, in the game, Lights, Camera, Pants!, it was seen for a brief moment to be pink. In the GBA version of Battle for Bikini Bottom, in a mini game, the player drives the boat mobile. If the player crashes, it flashes briefly and looks like a red jalopy.
As revealed in "Mermaid Man and Barnacle Boy IV," the boat has a manual transmission (when the two are trying to escape from SpongeBob in the Boat mobile, Barnacle Boy exclaims "I told you we should have got the automatic!")
The Invisible Boat mobile is probably an Oldsmobile, as hinted when Mermaid Man popped the key.
It is a parody of Wonder Woman's Invisible Jet and Batman's Batmobile.
It is notably similar to the Wario Car from the game Mario Kart: Double Dash, especially its high-performance traits.