Blatant exposition.
Don't get me wrong, exposition is important, and the viewer needs to be given information about who people are and important details to the story, but sometimes it's soooooo lazy, and when it is, it's just an immediate immersion breaker.
Like characters turning on a television that's immediately discussing something incredibly pertinent to the story, or having unrealistic conversations where they overtly share details that wouldn't come up regularly, or that both parties already know. Sometimes entire characters only exist to deliver exposition.
It just can be incredibly ham fisted when done poorly.
The contrast with clever and/or subtle exposition is drastic, because it definitely can be done very well.