I have no doubt we've all done it. We're watching a movie or TV show and they're doing something that we personally know really well.
Maybe you're a dancer and this person is supposed to be a prima ballerina and you're thinking, "Nope. No way." Maybe you pitched in college and watch an actor try to throw a fastball and you can't help but laugh.
The one that always gets me is when they show newsrooms in TV and movies. I spent several years working in a newsroom day-in and day-out. Whenever I see it on TV I think to myself, "How could they get this so wrong? I mean, just ask someone. Anyone who has worked in news could tell you that a reporter in a small town doesn't have his or her own personal camera person or a field producer! They're likely shooting everything by themselves and writing the story on their smartphone in the back of their Accord that has more McDonald's wrappers on the floor than they'd like to admit."
Turns out Hollywood doesn't always get firefighting right either.