Spaceballs (1987)

Continuity mistake: The head of Mega-Maid mysteriously shrinks in size. After Spaceball-1 transforms into Mega-Maid, the head is gigantic enough for a Winnebago to fly through for a considerable length of time. However, later on in the film, after the head has been jettisoned and crashed on a beach, the head is only big enough to hold a few dozen people. This can be determined by the size of the people coming out of her nose.

Continuity mistake: After Dark Helmet has stolen Lone Starr's ring of the Schwartz and dropped it down in the grill, Lone Starr is wearing it again after he gets into his Starship.

Deliberate mistake: There is a shot of the huge Yogurt statue that is in slow motion. You can see that the smoke from the statue is rising slower than it normally would. This was obviously done to make the shot longer for Mel Brooks' voice over to fit.

Trivia: When Skroob's ship arrives at Planet Druidia, Colonel Sandurz says the ship is preparing for metamorphosis to which Lord Helmet says "Ready, Kafka?" Franz Kafka wrote the book "The Metamorphosis."

Trivia: Mel Brooks allegedly waited so long to create his spoof of Star Wars as he wanted to spoof the entire trilogy.

Trivia: President Skroob's name is an anagram of Mel Brooks' last name.

Computer: This ship will self-destruct in exactly ten seconds. Counting down. Ten, nine, eight, six.
President Skroob: Six? What happened to seven?
Computer: Just kidding.

Dark Helmet: Before you die there is something you should know about us, Lone Star.
Lone Starr: What?
Dark Helmet: I am your father's brother's nephew's cousin's former roommate.
Lone Starr: What's that make us?
Dark Helmet: Absolutely nothing! Which is what you are about to become.

[The self destruction cancellation button is out of order.]
Dark Helmet: F**k! Even in the future nothing works!

Question: When Spaceball 1 achieves ludicrous speed and overshoots the Winnebago, Barf is heard to remark "they've gone to plaid". Is this just a joke about eighties style special effects or is it a reference to a specific film?

Question: When Dark Helmet says that there are two sides to every Schwartz, is this an obscure reference to something else, besides the obvious light side and dark side of the force?