People magically get drinks, often without ordering or waiting and then don't pay. Also overly vague orders, there's probably near 10 options for a "whiskey neat" at your average bar, but there's never a clarification.
Sorry, long time to answer but one of my most hated tropes in shows/movies is the bartender shaking a drink in a Boston tin and just dumping it into a martini glass. No ice. No strainer. Just I'm assuming water poured into a glass. I see it more often then I should. Also "leave the bottle." Fuck off. Order as you go mofo. Ugghh. I have more but those are a few.