Scooby-Doo! And Kiss: Rock and Roll Mystery

Question: Why did Velma believe that everything that happened was just a hallucination, considering in the previous movies the Mystery Inc. Team dealt with zombies, voodoo, aliens, witchcraft and even got pulled into a computer?

Continuity mistake: When Shaggy and Scooby are approaching the Demon as he eats, it is shown that he is eating from a platter of hamburgers and french fries. Scooby and Shaggy bump into his table, knocking the food all on the floor. When Shaggy and Scooby quickly put all of the food back on the table, it now has french fries and hot dogs.

More mistakes in Scooby-Doo! And Kiss: Rock and Roll Mystery