6
The Ship is an OSHA Nightmare

Two starships meet for battle and open fire. A photon plasma space torpedo slams into the hull. Inside, on the bridge, we watch as the whole room shakes, throwing the cast around like rag dolls. A second impact causes sparks to fly from the control panels, possibly even killing an extra.
The battered crew can only wonder why, on a ship that has technology in place to keep them from getting splattered against the rear wall when it jumps to light speed (or stops suddenly), every impact shakes their world like a kid rattling a Christmas present.
Why They Need To Stop:
We know why they do it. It's a way to add an element of danger for the main characters. That tends to get diluted if they're sitting comfortably on the bridge while the battle goes on in their view screen.
But no matter how far into the future you set your film, if the cable guy can keep our TV from exploding when lightning strikes the house, why does this futuristic spaceship have a panel blow every time anything remotely interesting happens on the ship?

And more to the point, why is the crew in an exposed spot at all? Sure, there are those ships (like most in Star Wars) that have windows, but, why do they need them? That's what view screens are for. Nobody is trying to navigate that bastard by squinting at the next planet through a dirty windshield. Look at the protruding command towers on the Star Wars Star Destroyers--at least once we see a fighter smash into their window, causing the whole damned ship to crash.
And if the bridge doesn't have windows (as it doesn't in Star Trek), then why in the hell does it need to be in some exposed spot where any random object can destroy it? Why not bury it in the middle of the ship, with layers of metal between the guys at the wheel and all of the exploding warp phaser missiles outside?
Don't tell us we're over-thinking this, damnit! That's what sci-fi is for, to make us feel smarter than people watching other movies.
5
The Futuristic Conversation Rule of Three

Two characters will be carrying on a normal conversation. One character will try to make a point by listing historical references. First, the character lists two references from the real world to set up a pattern, then tacks on a completely fictional reference that's either alien or hasn't happened yet. Like this exchange from The Wrath of Khan:
"You'll be remembered among the great scientists: Newton, Einstein, Sulak."

Sulak?
See, the first two establish the caliber of scientists we're talking about. Sure, you've never heard of the third one (Trekkies notwithstanding), but if he's on the same list as Newton and Einstein, he has to have cured cancer or something, right? It helps keep the story rooted in the real world as we know it.

"Let's play a game like Chess, or Monopoly, or Bleep Glorp. Or Jenga."
Why They Should Stop:
There's something corny about the way they always start the list off with something that happened close to the time when the show was made, rather than starting close to when the characters are supposed to live. It would be like starting off your genocidal references with the Jerusalem massacre of 1099 rather than the Holocaust.