Mine is really how confusing some of the language is. It's difficult to know how to hold a club when books say to have about as light a grip as you can, but people tell you that your grip is too "weak". Really; who came up with "strong" and "weak" to describe "rotated clockwise or counterclockwise"?
Seeds on the green? That's so horrible I'd never come up with it. That's even worse than people who seemingly intentionally play slow.