[wigster]

I heard they were writing the scenes of Casablanca as they filmed it. seems to work out ok.

[shalmanese]

Animation differs from live action in that it's edited, then shot instead of shot, then edited.

[SquirrelOnFire]

They hadn't written the ending of Die Hard when they started filming - the Movies that Made us episode about it is pretty wild & illuminating.

[stevage]

The Lord of the rings movies too. So much extra footage shot.