Continuity mistake: When the gang arrives at the fashion show, they park the Mystery Machine at the end of the walk way. But when the head of the fashion show is shown, the Mystery Machine has vanished. (00:03:05)
Continuity mistake: There is nothing on the runway as the gang is standing on it at the fashion show place. But moments later, they look down and the pile of crushed limestone just appears. (00:04:15)
Continuity mistake: When the gargoyle swoops down to grab Danica, the floor keeps shifting around under her as the camera zooms in. The tracking of her body to the floor is way off. (00:00:40)
Continuity mistake: After the French movie star kisses Velma's hand, she holds it out and gasps in star struck stupor, with her palm out. The shot cuts to a wider shot and suddenly it's palm in. (00:12:20)
Continuity mistake: The gang investigates the trail of limestone to a manhole in the middle of the street, with nothing around it. But when Daphne is putting on her "Wallowing galoshes" boots, somehow a small brick wall just materializes in the middle of the street for her to sit on - and then vanishes a couple shots later. Not just the fact that it appears and vanishes between shots, but that there is a random brick wall in the middle of the road. (00:05:10)
A Scooby-Doo Valentine - S3-E3
Plot hole: It's never explained how JC Chasez and the Hollywood extras impersonating the gang gained the super strength they possessed to do things like ripping car roofs open or holding up the Mystery Machine.
Answer: Well, apparently he doesn't have an issue with having dogs at his presence, only with having skin contact with them.
Rassdyt