1. Magic Hacking Powers
The problem: There is no graphical hacking interface, it is just miles upon miles of code. No flashy graphics, massive downloading bars, or any of that crap. Also, why wold the FBI, CIA, KGB, etc. hire any computer specialists if a 6 year old kid can get past their defenses. Hackers aren't imbued with godly skills at birth, it involves some studying and practice.
The solution: Just reference the hack, and never show a custom interface again. Also, I never want to hear the word mainframe in a movie again.

2. Over and over and over and . . .
The problem: Taking an otherwise great line, and inserting it directly into the trash.
The solution: If you have a good line, say it once. Watch Gone With the Wind and you'll understand.

3. Killing is for Pussies
The problem: You have your arch-nemesis (can be protagonist or antagonist) right where you want them. Do you kill them? Hell no, that would be too easy. Why don't you run away and let them come back in the sequel, or explain your elaborate plot in full detail first? Either you have some pretentious "moral code" that prohibits killing and allows for casual sex, or you're just too damn dumb to do the job which is kinda strange considering the nuclear weapon you just built from a condom, pen, and a cracker.
The solution: Shoot, Stab, Strangle, etc.

4. Shoot and Say
The problem: Can't you shoot some one and let it be. I don't want to hear your stupid-ass, "I thought you said smoking was hard to quit." You aren't clever. You are a complete tool.
The solution: Shut the hell up

5. Children
The problem: I was a kid once. I don't remember having a bowl-cut/mullet, being a snarky jackass, hanging out with ghosts, booby-trapping my house, hacking the FBI, getting possessed, saying complete sentences, or any crap like that. When I was a kid I just wanted to play some Pokemon, watch Blue's Clues, and drink my chocolate milk. I didn't have time for a damned adventure around the world. I had better things to do.
The solution: Force every writer who wants a kid in a movie to spend two weeks at a kindergarten.

6. Raining
The problem: Whens the last time you flipped on the weather and it said, "Hey jackass! Its going to rain so get ready to be dumped, but don't worry your work it out with an hour long kiss. When you get home from the three hour spontaneously choreographed dance number, get ready for the pneumonia that will kill you."
The solution: Have the director stand in some real rain for an hour without an umbrella.

7. I can read this from space
The problem: Every serial killer ever in the history of the world has wanted you to know how long you have to live. They build a countdown, that shows the actual time to detonation, that even Ray Charles could read. The LCD screen is bigger than the damn explosives its connected to. Unless they're going to explode too, I see a way to increase your effectiveness.
The solution: Eliminated timed detonations, remote works better.

8. Free-spirited people
The problem: These people aren't free-spirited. They're a damn cliche, and they do what we expect them to. You didn't teach me anything about life, aside from the hate I now have for this phrase
The solution: Delete this phrase forever.

9. Win her heart
The problem: Nice guys like girls who like douchebags. No exceptions. Its their job to identify douchebags, and "enlighten" their dating partner that they are going down a bad road. Naturally she won't buy it until the mandatory cheating scene. She'll spend hours making a choice that we saw coming for longer than the movie has been out.
The solution: Burn all scripts and movies with this "plot device"

10. Dramatic timing
The problem: Things only work when you really need them to. I've seen this first hand in my life. Whenever a masked serial murder chases me through a burning, collapsing, and radiation soaked building the elevators will wait until I actually need them to open their doors. Electricity only works with dramatic timing.
The solution: Remove any scene with an elevator, and all elements of dramatic timing

11. Radiation
The problem: Radiation = invulnerability, speed, strength, agility, increases you height, willpower, endurance, wisdom, catchy one-liners, flying, laser vision, super vision, heat vision, cooling vision, 20/20 vision, good mutations, regeneration, reincarnation, extra limbs, green glowing auras, cures the common cold, doubles your sexiness, fixes your life, kills the little aliens, basically anything to advance the plot.
The solution: Leave the 50s

12. Transitions
The problem: Some douchebag discovered time lapse, and directors know him as God. If you need a shitty transition then flip the shit switch on your Satanic power over time. Seeing all of those people and cars fly by while keeping the character in normal time will unveil his inner conflict. This will show off your artistic genius, and none of your douchbaginess.
The solution: Quit drawing the pentagrams and put down your spellbooks. Put in a damn fade instead.

13. I WANT YOUR MONEY
The problem: HOLY HELL MAN, THE FREAKING ARM JUST MOVED! WAS THAT CAPTAIN AMERICA'S SHIELD ON HIS DESK? HOW WILL THEY LIVE THEIR LIVES AFTER THIS? I loathe movies that are:
A) Obviously going to have sequels
B) Movies that exist solely as transitions
C) Movies that hint towards the new "secret" movie
Why can't there just be one movie anymore? I'm perfectly happy not knowing who the main character's great-great-great-great-great-great-grandson's girlfriend's friend's landlord's nephew's barber's brother's daughter's professor's assistant's sister's roommate is up to. I don't want to see the monster come back. It was perfectly fine at one movie. However, since I'm a director and want all of my fans to suck on my ass, I'm going to make it a trilogy, and then throw in a pre-trilogy, and a post-trilogy. That way you can pay for all of the gold leaf that I wipe with. Just leave it be. I don't want you to ruin another franchise that I worshiped just so you can keep your fifth Mercedes.
The solution: Two words: Forced retirement