When John and Lt. Reljik are fighting on top of the generator unit, it has a solid top. As soon as Lt. Reljik is "thrown" off, it has an open top like all of the rest of the units.
When Chrichton points a weapon at Grayza.
Wayne Pygram (the actor playing Scorpious) )uses the wrong word twice in the same sentence: referring to Commandant Grayza as a Commodore (something else entirely). In the same sentence, Scorpius also tells someone to 'accommodate' her to her transport, instead of 'accompany'.