Other mistake: When the characters go to the Himalayas, the whole time, like for 20 mins, including the confrontation scene, they are all wearing casual, short-sleeved shirts. You can see Mr. Burnish's henchmen wearing winter clothing, while the main characters don't freeze to death. They only start getting cold after a long time.
Other mistake: At times when everything was covered in ashes, Jeeps being driven over ashes had clean tires (black tread). One Jeep that was airborne for a couple seconds (coming out of a fire) had clean tires, but the tires later got dirty. (01:04:27 - 01:09:46)
Other mistake: In the fight at the beginning of the movie, Kim bends over and launches her jet-pack towards the villains. Almost everyone falls down way before the jet comes anywhere near and/or receive no impact, but they are KO as if they took a rocket to the gut. (00:01:40)
Other mistake: Throughout this, a running gag is that Fred can't drive stick/clutch. However, in "What's New, Scooby-Doo?" Series 2, Episode 6 "A Scooby-Doo Halloween," he yells at Shaggy that he's riding the clutch too hard at the beginning of the episode. If the Mystery Machine has a clutch mechanism, he would know how to drive stick/clutch.