People pump their remote controls at the TV when pressing buttons.

Remote controls send a infra-red or radio signal, both of which travel at the speed of light, so pushing the control forward isn't going to make it go any faster.

This action dates back to silent movies where gangsters would pump their revolvers when shooting them in order to make the action obvious.

Mobile phones are disabled by breaking them into two and thrown out the car window.

Phones aren't that easy to break, and even when they are, data can easily be recovered from them. They might even still work with the cover broken off. Simply removing the battery would be far more effective.

Removing the battery wouldn't convey the message that the phone is now useless and can't be traced or have information extracted from it.

Passwords are always a single word, and in upper case.

Many people do have single word passwords, but almost never in all upper-case. Most situations in movies that require passwords would in real life not allow a single word as a password.

All upper-case makes it easier for the audience to read the password, and being a single word makes it more believable that the character was smart enough to guess it.