Maybe a bit niche, but in higher level math courses, instructional material often seems out-of-touch, written by professionals for professionals. Inconsistent notation between authors and unexplained symbols in equations are also royal pains in the ass.
My monitor had a bright blue power LED smack in the middle of the lower bezel. I took it apart on day one and brutally ripped out the LED, only then did I ever connect it to my computer.