After planet Spaceball gets the code for the airshield from King Roland they change into MegaMaid. You can see that when the airshield opens for them to suck out the air, that the side of the planet it's on has a land mass that looks like Africa on the bottom of the planet. But, when Lone Star and Barf go back to Druidia to return the princess and Dot, the place where the airshield is looks completley different than it did when the Spaceballs were sucking out the air. Check it out.