"Save The Cat" is of course the ultimate example, the idea being right at the start you have to show your character as likable.  I was thinking about that because I rewatched "The Queen Of Versailles" last night and that moment doesn't happen until near the end of the movie, and it's much more powerful for happening there instead of at the start (I won't say what it is in case you haven't seen it yet), but it just says that these moments don't have to happen by a certain page, they have to happen at the right MOMENT.