James Cameron's "Titanic" was meant to be the most historically accurate depiction of the sinking of the Titanic to date. He even funded submarine explorations of the titanic to get the right look and feel of the ship in the movie. When Neil deGrasse Tyson first saw Titanic, he noticed a mistake. In the scene where Jack dies, Rose looks up at the night sky. Neil, being the astronomer he is, noticed that based on the location and date of where and when the Titanic sunk, Rose was looking at the wrong sky. Not only was it the wrong sky, but half of it was just a mirror image of the other.
Neil decided to write a letter to Cameron, informing him that he used the wrong sky, but never received a reply. Three years later, Neil ran into Cameron at a conference hosted by NASA and brought up the letter he wrote and obviously his issue with the sky. Cameron replied by saying that that wasn't his fault. It was actually something added in by post-production. Neil later brought it up during the conference and Cameron responded with something along the lines of "My movie grossed x million dollars at the box office. Just think how much more money it could've made had we used the right sky."
Even better... A few years later, Neil got a phone call and the guy on the other end says, "Hey I'm *so and so* and I work in post-production for 20th Century Fox. We're working on a remastered version of the Titanic, and James Cameron says you have a sky we can use?" So, fifteen years later, Neil finally got to fix his sky.