Have you ever watched a movie a couple times and thought "I could do better", and proceed to either rewrite the script, or at least just figure out how the story would be better?
I do it constantly, but one specific example is my current project; Rewriting Pacific Rim.
I determined that, to make Pacific Rim great, it all boils down to Mako. She needs to go. Her development and conflict do nothing but add to the 40 minute gap between the first and second action scenes. What we have to do instead is change Raleigh's brother Yancy into a female to maintain the female lead (Nancy?). Then have her not die in the very first scene.
See, my logic is that I cared more about the relationship between Yancy and Raleigh after the first 5 minutes than I did about Raleigh and Mako after an hour and a half.
Second, we'd remove the Australian kid, and his place in Striker Eureka would be replaced by Stacker Pentecost, since Stacker and Herc have a great relationship.
Now, of course, you're wonder "but Jink, what about the best scene in the movie, Mako's flashback!?" And to this I say, fear not dear disciples, we'll maintain it. However, instead of Mako, it will be the Becket siblings, and they'll be just a touch older. Stacker's rescue is what inspires them to be Jaeger pilots.
The entire idea is to flesh out the interesting characters and drop the one who, while a strong female lead, is simply not an interesting character. This movie shouldn't be about characters meeting each other and creating a relationship, it should be focused on people who have existing relationships so that we can use precious run time to watch giant mechs beat the shit out of giant aliens.
Oh, also; More Charlie Day. So much more Charlie Day.