Andreas Hartl sent me this one:
My favorite (from ST:VOY, some episode in season 1 or 2):
The crew of the Voyager has to get some samples of a rare and highly needed plant from the surface of a planet. The whole episode no restrictions of where to find this plant were made. Yet as they decide to go down on the planet, Paris makes one proposition: “I recommend to wait until noon; the weather on the planet can be very unpleasant during night”.
Think about this. You are orbiting a planet. The planet is rotating on its axis. Half the planet is in night, and the other half of the planet is in daylight. If you don’t want to land on the planet during the night, you can just land on the side that’s in daylight. Although one could argue that the plant was from a specific area that was in night, but this episode sounds like the infamous “Tuvix” episode. There were no geographical restrictions given for the location of this rare plant.
This is one of the more common source of blunders: writing as though you are trapped on the ground. If you are on the ground, you do typically have to wait for daylight, but in space, daylight is just 180 degrees away.