There's only one Mystery Machine, or is there? Here are a few instances when the groovy van looks a little different than usual...
What a Night for a Knight
The back is filled with miscellaneous equipment, a ladder, lanterns, rope, etc., mounted on hooks.
What the Hex Going On?
There is a bench running longwise in the rear of the van.
Decoy For a Dognapper
The back contains a table and chairs, plus the walls are lined with computer equipment; there is a large antenna on the roof and a circular skylight.
The Spooky Space Kook
Another table, but this time the walls are lined with kitchen cabinets. More...