For me it happens in every project: You think about something good and exciting and than the scene turns out to be not suited for it. Simpel stuff like the wrong form of motion or it's just too short. It also happens that I can't pull of things like I imagine them, but that must be a lack of effort or skill.
Usualy I improvise around the original idea that is set around a few core scenes. I really have to get rid of the habbit and start to really plan stuff. At least I would need to for the bigger much more complex projects
