- 'Shaky cam' syndrome. Used sparingly, it can be effective enough, but when an entire movie relies on it to 'create a feeling of chaos', it's sickening. Examples: The Bourne trilogy (especially the last two parts), Cloverfield

- Excessive swearing for the sake of ... swearing? It's not cool, and it doesn't add anything. Again, used sparingly is okay, but if every sentence contains a fcuk or a biatch, that's pushing it.

- Then again, when filmmakers cut away all cussing in order to obtain a lower PG rating (make a film suitable for all ages) for a movie that's supposed to have some cussing, that's just dumb. Example: Live Free Or Die Hard. John McClane just ain't John McClane without it.

- All too obvious advertisements. When John Connor whipped out his Sony Ericsson in Terminator Salvation (it's a Sony Pictures film), I had to laugh.

- Bad guys can fire their UZIs and AK47s all they want at the good guys, and they rarely ever land a hit, where the good guys are more precise than professional snipers with their ordinary handguns.

- In horror movies, why does the group always decide to split up even though they know a killer is out to get them?

- Unimportant people die instantly to gunshots or stab wounds, but significant characters always survive long enough for a tearful and emotional goodbye.
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- when they get out of a car, they never close windows or lock the doors.
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Also in horror movies the car does never start immediately, only when the killer reaches the door. And they NEVER have a signal on their mobile phone.
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And someone who got 'killed' off earlier miraculously survives...
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The hero never looks to the final explosion, he always turns back before the explosion and starts to walk as it was a normal thing
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And no matter how old and dilapidated the barn/shed/cave/circus tent is... there is always an oxyacetylene welding kit available!!!

(Or am I just preempting the A-Team movie here...)
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casting a different actor as the same character that was used in the past xx episodes in some spaghetti-long series.
the hilarious part is when they try to convince the viewer that this character is well known and always was who she/he is, by suddenly directly naming him/her at every possible situation

or an opposite of that, casting one actor as some minor background character and then all of a sudden he appears as a different main character in the later episodes.
Alex Krycek from The X-Files anyone?
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Presenting a renowned director's name on top of a movie poster when, in actuality, s/he didn't direct the movie at all, but only produced it. Example: Hostel. This tends to happen more often with Quentin Tarantino-produced films.

Similarly, renowned actors' names credited on posters with huge lettering, even when their roles in said movies are only cameos, lasting no more than a few minutes.
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Videogames are also guilty of this: Crawling around in air ducts and on ceilings. Either is quite impossible, in reality air ducts are much too small for a person to crawl around in. In some larger buildings the main duct would be large enough, but the branches going out to the various vents aren't. And your typical office ceiling can't even remotely carry the weight of man, or even a child.
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- Guns with infinite ammo.

- The 10 second countdown takes over 2 minutes of film time to reach 2 seconds.

- A car jump, where the car's landing obviously completely smashed the whole front and chassis upwards, and yet in the next scene the car is undamaged.

- A car has a head on collision with another, disabling it, but then drives off with a slight dent in the wing or a headlight out. A great example of this was the Jason Statham film War, where he drives a Dodge Charger straight into the side of another car, completely disabling the other car. But then drives the car off and all that is damaged is the headlight and wing.
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