Automatic netflix previews are the thing that infuriates me the most about it. (And the reason I'll probably never pay for it.)

Other than opening the settings screen, or playing a video and hitting pause, there is no way to leave netflix alone and not have it make noise/play video. Three seconds after you stop hitting buttons, whatever's selected on-screen becomes a full-video ad for that thing. (with all of the annoying traits of ads, like loud attention grabbing sounds)

I've idle-mindedly mashed buttons to prevent this on console-netflix while trying to have a conversation about what to watch, with no attention being payed to what was actually on the screen.