I'm a big fan of rehearsal. I'm famous for pulling the cast together, not so much to formally rehearse, but just to run the lines. My theory of acting is that it takes all your attention just to stay in the moment, and keep your attention on the other person, and get him to do what you want him to do.
The character and the actor in a long-running series slowly become one. I think there must be funny stories about actors who, in the pilot for a TV series, did some weird thing with their eyes, or some speech impediment or something, and the next thing you know, it's eight years later, and they're still doing that freaking gag.
Here are the good things about independent films: They do the more interesting, chancy scripts. They're run by love.