Corrected entry: In the scene where the gang find the museum broken into for the second time, Velma's hair is straight from when she had her makeover. After that they go to the Mining Factory and her hair is black curled. She could have changed out of her outfit but I doubt she had time to do her hair.
Correction: When we first see Velma with her new hairdo, it's easy to see that she has her hair pulled to the side and has some sort of extensions in. Therefore, she could have taken her hair out from the sides and removed the extensions in the time given.
Corrected entry: There is a scene in which a ghost shoots harpoons through the back door of the Mystery Machine. In the next shot, the harpoons are gone but there are no holes in the door of the van.
Correction: Now look at the door when the van is back on the road if you see the little black hole, that is the holes made from the harpoons.
Corrected entry: When the pterodactyl is dragging Shaggy and Scooby, Scooby is on the right and Shaggy is on the left. Then when Daphne cuts the rope Scooby flies out on the left and Shaggy on the right.
Correction: Scooby and Shaggy went flying many times, which could have easily caused the rope to twist.
Corrected entry: When Velma loses her glasses, wouldn't she be able to identify Patrick by his voice?
Correction: Maybe she did, but she made sure that it was Patrick after she put on her glasses so she wouldn't make any embarassing mistakes.
Corrected entry: The electricity from the 10,000 Volt Ghost would kill a person. But Daphne, or anyone else for that matter, is not killed when near it.
Correction: Volts are not deadly - amps are. Van de Graaff generators are electrostatic devices that might produce 200,000 to 400,000 volts depending on the relative humidity. They are safe to touch while operating.
Corrected entry: Near the end when Shaggy is putting on Captain Cutler's helmet, you can hear Scooby say "Mary Jane is a man in a mask" which is a line from the first movie.
Correction: This isn't a mistake. This is trivia.
Corrected entry: When the Black Knight and the 10,000 Volt Ghost are attacking both Fred and Daphne, Daphne pulls some jumper cables out from the Mystery Machine however just before they made it to the junkyard they show several scenes of the van's interior with no jumper cables visible. Those cables were huge and would be rather uncomfortable to be sitting on.
Correction: Scooby crashed the van into the doors of the mining company, and we don't see into the van until we see the jumper cables. They were probably shaken out of their storage place in the crash - certainly Daphne was surprised to see them there.
Corrected entry: In the scene where Velma has her dramatic makeover, she can't seem to walk in the shoes and finds it hard to bend when she gets in the Mystery Machine. However when she gets to the museum, she can walk fine and when she re-enters the Mystery Machine, she bends her legs fine.
Correction: She simply got used to walking in the shoes and bending her legs.
Corrected entry: To make monsters,according to the film, you need a costume of that monster. In the scene just before Shaggy and Scooby reach the monster hide, they encounter the Cotton Candy Glob but there is no Cotton Candy Glob costume in the museum.
Correction: Actually, in the long shot of the hall just before the window is broken, you can see him off to the left of the screen.
Corrected entry: Velma's hair grows when she is in the tight red outfit.
Correction: Velma's hair is curled usually. When she is in the tight red suit, Daphne had straightend her hair.
Corrected entry: Many times, The Mystery Gang's clothes change throughout the movie
Correction: The movie is set over several days.