Visible crew/equipment: Right after Barf and Lone Starr have stolen the two spaceballs outfits they run by a hallway with two guards in it. After the guard sees one of them and says "Nahh", look at the top of his helmet - you can see the camera and director.
Visible crew/equipment: After Dark Helmet drops Lone Starr's ring into the vent and Lone Starr tries to retrieve it there is a quick shot of Lone Starr getting up and backing up against the wall. If you look closely you can tell that it is a stunt double.
Visible crew/equipment: When our heroes enter the temple of Yogurt, there is a shot where Vespa says "Whats gonna happen now?" Behind them you can see the track the camera moves on. After the giant statue says "Silence", the track is gone. (00:45:10)
Visible crew/equipment: In the desert, Helmet asks the guys "combing" the desert if they've found anything. The camera crew is reflected in the helmet of the guy that says "we ain't found shit."
Answer: Its a reference to how the stars streak around the ships in "Star Wars". "Ludicrous speed" had to have a ludicrous color. It is also referencing 2001: A Space Odyssey, where this "tartan" effect occurs when Dave is in the pod towards the end of the film.
Grumpy Scot
Those answers are quite correct and possible, but how about this: Warp and weft are the two directions of yarn in weaving (of plaids and other things). It might be a very meta joke since plaid is at much higher level than warp. On the other hand, it's Mel Brooks. On the gripping hand, he was born in Brooklyn in the mid 20's and might have been exposed to the basics and vocabulary of the tailor at a young age.
Btw, it's also a clear reference to the sentence from Star Trek "They've gone to warp."