The movie originally ended with the Terenzi brothers as the survivors of the exploding spaceship while Dave perished after killing the giant Klown, but since the executive needed a "upbeat ending" the Chiodo brothers filmed a second ending that is in all the versions where Dave and the Terenzi brothers survive the exploding spaceship by hiding in the "klown kar".
When the Klown is chasing the man in the car, he is supposedly floating in the air. In some shots, you can clearly see the black motorcycle carrying him in the air.
Why did the Klowns put debbie and the other women into giant balloons?
A
Debbie and the other women are put into balloons to keep them fresh for later in order to eat some of them. It would also appear there are others trapped in giant balloons below on another floor so that the giant klown can eat some of them too! Other reasons are to impregnate the girls or to turn them into female klowns as well! But it's not fully known if this is truly the case or not. It's possble the klowns may have more than one way to reproduce their race, it should at least be noted that there were two female klowns on board the spaceship.