I was watching the orgininal MM again, and I noticed other cars, parked in the MFP garage, in the scene where max meets the pursuit special.
I know the other yellow cars are Big Bopper and March Hare, and that the Nightrider’s Monaro is in the foreground, with a light bar on the roof:

But there are cars covered in black sheets, with white writing on them. What’s the deal with them?
There is also a weird white car with jets, which looks like this:

It looks like one of the cars made to break the land speed record, but what’s it doing as a prop in a low-budget Australian film?
The link to the full scene is below, I recommend you watch it before answering
https://m.youtube.com/watch?v=fPC3E6ZhjTI (Sorry about the American dubbing)