Revealing mistake: During the merchandise segment, Spaceballs the book is actually a Transformers comic book. You have to look closely at it.
Suggested correction: That's part of the gag.
Continuity mistake: After Lone Star and Barf drop the giant hair dryer, they lift up the empty case. In the "Instant video Cassette" of the movie, Lone Star and Barf are lifting the case, but the hair dryer is missing.
Suggested correction: It's not the same scene. Notice that in the scene where they drop it, it's relatively flat where they are walking. In the instant cassette scene, they are walking down a hill.
They were by a hill, but the angle didn't allow the camera to see it.