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.