When coming up with a new title for the film, replacing the original title "Planet Moron", when they heard about the British science fiction spoof "Morons from Outer Space". Mel Brooks, Ronnie Graham and Thomas Meehan went through all the letters of the alphabet, to search for a word to add to "Space", which Thomas Meehan suggested. But, Mel Brooks spilled a drink and shouted "Balls!" and Ronnie Graham said "Spaceballs!" which became the film's new and final title and they came up with the idea that the villains The Spaceballs, would wear ball shaped helmets.
When Lone Star, Barf, Vespa, and Dot (or rather, their stunt doubles) are running towards the closing door, it is almost completely closed. In subsequent shots, it is open much wider than before.
When President Skroob is beamed into the next room, his head gets turned backwards. Yet for some reason, no-one notices that his hands have also been reversed.
No. This movie is a parody on the original Star Wars trilogy among other films such as the Star Trek series. However, there is a book adaptation of the movie called Spaceballs: The Book by R.L. Stine (aka Jovial Bob Stine).
Q
Why were Lone Starr and Barf on Dark Helmet's hit list?
A
Lone Starr and Barf are mercenaries of sorts. They have likely crossed paths with the Spaceballs several times in the past, likely foiling some of their foolish ploys. Not to mention, Lone Starr is the only man to dare give Dark Helmet the Raspberry.