A possible suggestion:
I've at times completely forgotten to finish a film and extended it, sometimes even at 99%, which needless to say is frustrating. What would therefore be an idea is if there were some way of seeing the rewards a film gives as you are filming.
I often forget what the rewards for finishing my film would be after starting them and as such, I'm sometimes unsure whether they are worth the effort finishing if I run out of time. If I know I'm missing 4SP or an epic item I was going for, I'd like to be reminded. Equally, if all I'm going to get for finishing the film are a few extra notes and XP, then I'm not too bothered about finishing the movie since extending the film won't be worth it.
Would also be good if the rewards were displayed as you were filming, just so you remember what the rewards are while doing a film. Maybe as a popup window when hovering over the stars?
Having said all that, I'm one of those players that always makes 3 star films, even if it isn't worth it