No problems here.... It's just a goofy looking keycard sort of thing. If you'll notice, he doesn't turn it when he goes in to the prison 'ball' either.
care factor minimal. anyone who has seen the movie knows it's a nonsensical, get as many laughs as possible film that isn't meant to be realistic. when's the last time you saw a winnebago complete with tyres flying through space without being sucked apart?? my point exactly.
I wouldn't worry about the key. At this point in the movie a huge slip up occurs. Dark Helmet actually HITS A CAMERA MAN with his "light saber" and you can easily see it on the tape. This bothers me most. What sloppy filming.
Dave, I sure hope that was a joke. The cameraman (or whatever he is) thing was totally intentional. Dark Helmet even points at Lone Star and says "Um...he did it".