Little internal contradiction that bugged the crap out of me:
In STTNG, there was this episode where LaForge and Roe (sp?) get “phased.” In other words, they become little more than ghosts (along with a few Romulans). They are incapable of touching anything, and they phase right through walls.
One little problem with this type of scenario: How the bloody hell can they walk on floors? Were the soles of their feet left solid? If so, wouldn’t they start kicking people around until someone noticed that something was odd on the ship?
To add insult to injury, there is this scene where Ro/Roe/Whatever takes the turbolift, and lets out the oh-so-cheesy “thanks for the ride” line to the other person who presumably can’t hear her. How the hell can a ghost who can’t touch anything take a turbolift? And why the hell would they even need one?
Similar annoyance with DS9:
The pilot episode. Sisco (damn, I really can’t remember how to spell their names) gets to meet the lifeforms who inhabit the worm hole. These lifeforms exist outside of time. Temporal laws do not affect them. Fair enough. So, Sisco is lamely being taken to different moments in his life as he discusses with those creatures. However, the discussion turns out to follow temporal laws. Questions are asked, answers are given, etc. Wouldn’t this form of communication be impossible for non-temporal creatures?
Anyway. There are many more such things, but those two always bugged the hell outta me.