A running gag throughout the Mel Brooks movie,
"Spaceballs" is recurring product spots for the film's promotional
materials
From IMDB:
In a 2013 television interview (shorty before receiving the AFI Lifetime Achievement
Award), Mel Brooks stated that he personally obtained George Lucas' full permission
to parody any and all things Star Wars-related but, on one condition, that absolutely no
merchandise of any kind be produced from the film. This is the reason why all Yogurt and
the Dinks do is merchandising (it is also why none of the merchandise seen in the film was
ever mass produced or publicly sold in any way).