When the gang entered the sunken ship, the ship had no water. Sunken ships are supposed to have water inside.
Villains: Captain Clemens and a wanted thief.
In the episode with Don Adams in The New Scooby Doo Movies, Shaggy doesn't know how to swim when they are tossed into the pool. But in this episode, Shaggy can swim.
Fred: But what's the creature doing in land?
Captain: Aye, probably searching for victims so that it can steal souls.
Shaggy: Whoa! Then my spirit is unwilling
The Creepy Heap From The Deep is in the game Scooby Doo: Night Of 100 Frights.