For the avid readers on the sub: What are some early red flags in books?

The guys, and a lot of people here, have been following videogames long enough to be able to recognize design cues or patterns that can set off alarm bells, things you can usually pick up on instantly. Things like bad camera controls, bad jump feels (Pat has written off a few games after jumping once and hating it), poor hit feedback, etc. To some degree also extends to being able to point at a game trailer and go "That's fake" or "That's dead in a year".

I curious what the equivalents to these kinds of things for books are, since I don't read often enough to pick up on them and have to get pretty deep into a book before deciding if I'm enjoying it or not. The cliches and habits that immediately make you realize the book probably isn't very good.