Corrected entry: When Lonestar and Helmet are fighting near the end, Helmet takes Lonestar's ring. In one scene after this he is standing near the self destruct button. The camera operator is visible in the glass of the button. It is clear enough you can see that he is wearing a "Spaceballs" shirt.
manthabeat
30th Jan 2018
Correction: Most likely intentional since we see the crew during the fight.