Personally, I agree with the star-casting (or friend-casting) when I write. I once had a script that I was stuck on--the story was close, but not where it needed to be. Once I "recast" my protag, everything fell into place.

I've never done the music suggestion before. Maybe I'll try it on my next one. Thanks for the great idea!

Nice tip - I think I subconsciously do something similar to this when listening to music while writing. The type of music I listen to will cause me to write dialogue/character actions with a certain attitude or emotion. I think, "How can I convey the emotions provoked by this song via my script?"

Of course there are instances where this wouldn't help - i.e. listening to Tupack while writing a family film...