I don't know if this is a cliche exactly, but it bugs me. In many martial arts movies, or scenes from non-martial arts movies where martial arts are implied (Worf) There are two things that get done a lot. One is the "Hollywood Back-knuckle" which I've ranted about before. Basically, if you miss you can tear your rotator cuff. The other is the "Pose of Death" Van Damme is the main offender with this one, but it was in Enter the Dragon as well. A fight can go on for a long time, bu you know it's over when the hero lands a blow and holds it in place as the bad guys falls away. Usually the hand of foot is shaking slightly as it's suspended in the air.

Another one that got on my nerves in last season's 24 was the implication that everyone had a the ability to recall any phone number they heard, no matter what.

"We just killed a man in your living room. His partners have your husband and are trying to get him to help them set off a nuk-u-lar bomb (Jack Bauer can't say nuclear). Your son is missing and wounded. Call 867-5309 and tell them that I'm on my way to 8915 vista way. Got that?" And she does.

BTW, I understand the need for the 555 numbers, but they actually do bug me. Usually, I'm actually really into a show and they pull that number out and all the other crappy shows I've ever seen pop back into my head. In the US 555-1212 is used for interstate directory assistance.

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A Nerd can figure out how long it will take the original Enterprise traveling at warp 6.5 to travel from Regulus to Antares.
A Geek will think he can use that to pick up a girl in a bar.
A Dork knows he can't pick up the girl with it, but will hang around for hours anyway, just in case she asks.
She might. You never know.