There's inconsistency in Fred's wrestling costume's outer cape color. When Fred's shown wearing it for the first time from front view, the cape's color is white judging from the cape's attachment on his shoulder. However, when he's lifted by "Scientist", it's shown that the color is blue. Furthermore, the color of the cape's attachment is different in one occasion.
The aquarium's sign changed from "Do not tap on the glass" into "do not touch glass" when Shaggy and Scooby tried to hide from the Titanic Twist
Velma is incredibly strong, she has a special move she calls the "Flying Dinkley" where she is able to simultaneously toss two female wrestlers completely above her own head from the ground. Not even the strongest male wrestlers can do this in reality.
Connie and Curt Crunch must be really fast, since it takes them less than 10 seconds to get away from their father, wear the Titanic Twist costume, and go to gravity-defy suplex to meet Mystery Inc. for the first time.