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It's rather strange at the end of this short, the Mystery Machine is set adrift in outer space and the group is confident they'll be able to get back to Earth though they're millions of kilometers away from the planet. And exactly why was a parachute needed anyway? There's no wind in space and it's doubtful the Mystery Machine is spaceworthy to begin with. The oxygen certainly would have run out for sure.
Among the various items the aliens collected on their scavenger hunt are a pair of pants, which they're able to conveniently zap from Shaggy as he runs away from them. Somehow, he's able to get an exact replacement pair after he jumps into the bushes.
A shrunken Shaggy, Scooby, and Scrappy each wear springs in an effort to get to the shrink ray. Scooby is captured by the evil scientist and loses his spring in the process. When Shag and Scrappy bounce into action to rescue him, the next shot has Scooby wearing the same spring he previously lost.
The evil scientist enlarges the Mystery Machine before the shrunken Shaggy, Scooby, and Scrappy spring into action to stop him. However, after they capture him, they tie him up and drag him on a dolly tied along with the Mystery Machine which is still shrunken even though it was previously restored to normal size.
Scooby, Shaggy, and Scrappy were wearing gypsy disguises before they were changed into two giant chickens and a little lion, respectively. After they retrieved the amulet, they were changed back, but with Shaggy in his standard green shirt and maroon pants and the dogs with just their collars.