Can be anything, from characters not using objects they have on them, to physics not being realistic, or a very big plot hole.
As an example, one of my friends told me that his pet peeve is that in a lot of sci-fi movies, when spaceships run out of fuel, they stop moving, while inertia and lack of atmosphere should keep them in motion.
Any time the villain has the upper hand and then leaves the room with no reason not to just kill the protagonists.
Don’t get me wrong, I’m not hoping for the good guys to catch a bullet to the face. It’s just that it’s lazy writing. Give them a reason to be left alive, or create some distraction that requires attention. Not just “I want you to see this” sort of bullshit, but a legitimate reason.