((Okay, here's a couple tailor-made for sci-fi (although they probably can be extended to fantasy at least).))
Although the ship functions on a four-hundred person crew, barring serious repairs, in a pinch, the thing can be run almost as easilly by four to eight people on the bridge, and maybe one in the engine room.
And future civilizations have very limited culture, that's why they only refer to books and movies from the 19th, 20th, and early 21st centuries, unless it's a textbook or other work of important nonfiction. It's not like their own culture would progress along with their technology, or anything.
((And, getting back to my favorite subject smile )
When writing a prequel, here's a rule that you should always follow: any important characters introduced in the prequel who have not and do not appear in the original story/ies, must die by the end of the prequel story arc. This is especially true for any love interests of the main character, and most especially if the character is the first person s/he ever fell in love with. Think of it, have you ever seen or read a Young (fill-in-character-here) where the love interest introduced in the prequel made it to the end? ((If so, please tell me, it would probably be worth the novelty.))
((My main series is written in middle, beginning, end, format, for a number of reasons I will not go into. I'm still writing the first (middle) story, and I've forced myself to keep from mentioning several characters who appear in the second (beginning) story, just so I can keep the audience in suspense about whether they're going to die or not. Okay, and because some of them do die, but the important part is, not all of them.))
No matter how strong/smart/whatever your main character was to win the day in the first story, s/he will be back to square one when the new villain arrives for the sequel. Doesn't matter if your main character came out of the first story with the powers of a demi-god, s/he can still get trounced by the villain of the next story, and almost any lackey thereof.