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.
Star Wars Episode 8 is the one that lives in my head ever since it was released.
Play by play of the opening sequence battle:
First Order ambushes the Resistance base as it is evacuating
First Order summons a ship described as a “Fleet Destroyer”.
First Order only has enough time to charge one shot, but has 2 targets: The Resistance base full of intel and equipment that can’t move or the Escape Fleet with all the escape ships and evacuated people.
So, who do they shoot?
The base full of intel on the ground…
Oh man, the Disney Star Wars Trilogy is full of these.
I get that Star Wars movies are effectively a fantasy adventure series in Sci-Fi clothing, I’m not expecting perfect logical sense out of everything, but internal consistency has absolutely not been Disney Wars’s strong suit.