A parody of Science Fiction movies, especially Star Wars, Wizard of Oz, Planet of the Apes, Star Trek, 2001: A Space Odyssey, and Alien. The story revolves around Princess Vespa, who is kidnapped by Spaceballs while running away on her wedding day. Her father recruits Lone Star and his trusty sidekick, Barf, to bring her back home safely, and the trip home is quite an adventure.
Skroob, as in President Skroob, is an anagram of Brooks, as in Mel Brooks, who portrays him.
One of the ships parked at the diner is the Millenium Falcon from Star Wars.
In the diner scene, when the alien explodes from the man's chest, the man is played by John Hurt, who suffered the same fate in the movie, Alien.