- The "peekaboo" effect. Just because you don't see it, it doesn't mean you can't HEAR it, especially when it's a goddamn T-Rex in Jurassic Park. That's the most blatant example, but movies are full of situations where not seeing someone or something equals to never ever hear it just like it would appear out of thin air.
- Sex scenes with sheets. I completely understand that not all movies can show naked bodies, but in 80 years or so of sex scenes in movies, why nobody has come up with something different to cover the woman than "She's a wild fire of desire but she suddenly becomes prude and keeps the sheets up"? it's not mandatory to show people having sex, you can imply they go to bed without showing them in the act. If you have to make a sex scenes that screams "Not unrated movie, actress didn't consent to nudity", just stop the scene when they start to make out.
- Dramatic entrance with the perfect quip or remark at the very right moment. How many times in your life did you even had the chance or the occasion to say something just as you arrive or anyway when nobody else saw you around yet? I bet never. That perfectly timed kind of coincidence happens only in the movies.
- Protagonists not dying but knocked out and seemingly deaad. Maybe the first time it was ever done, it worked. But when you see the hero lying down and fearing he's dead... 100% of the times he's not.
- Arbitrary use of a foreign, "exotic" language, between people speaking also english. The Lord of the Rings movies are filled of examples of elves speaking english and then saying a dramatic and poignant sentence in the elven language. And if there's a movie set in Japan or China, you can bet to hear those people starting to speak the language and then switching to english for the rest of the conversation (or the other way around).
Who the hell does that in real life? I'm italian, the translation of "let's go home" is "andiamo a casa". It's like I would say "Hey buddies, it was great hanging out all together. The dinner was delicious. The hour is late however... andiamo a casa". Who the hell ever spoke like that?