I wish I could say that the key to making a good show or movie is to do a good amount of research. I wish I could say that, but there are a lot of popular shows and movies that kind of don't make sense when you really pay attention.
But even if that's the case, these movies and shows can still get popular. After all, accuracy isn't the most important part of telling a good story. Which means there were a lot of good examples for Redditors to chose from when asked, "What movie/tv show clearly didn’t research the subject it tackled?"