Former "National Lampoons" editor Ted Mann, who scripted this science-fiction comedy, calls it "The first outer space road movie." According to Mann, the film has "no scientists, no techies, none of the unusual polished, sanitary environments we're used to in our space films. Space is like anywhere else - the people who are there are underpaid and poorly regarded."
There's numerous events where laws of gravity and other physics are neglected, but the most notable is probably the upright flame of a lighter in a place where there's no air and no gravity.