Early in the film, several gamblers attack Dirk after one of them reveals Dirk has the ability to read through cards. Later, the same gamblers playing cards with Dirk.
During the opening credits, a list of cast members with lesser roles states "In alphabetical order". The names are not in alphabetical order, by either first or last name.
About 50 minutes into the film, someone says the raiding ships can "reach a velocity of several parsecs". A parsec is a unit of distance (a contraction of "parallax second"), not speed. One parsec is 3.26 light years (19.2 trillion miles, 32.6 trillion kilometers).