The director had a lot of creative freedom on this project; the film's backers essentially 'handed him a blank check'. [=let him direct the film exactly the way he wanted to]
At the end of the movie, the narrator goes back and 'fills in' (all) 'the blanks'. [=the narrator provides missing information about the movie's plot]
He says that the first hour after the accident is a complete 'blank'. [=he cannot remember anything that happened for an hour after the accident]
(..) And who are you? Look, I'm telling you, you didn't kill Jones. If you did, we'd be erased. You wouldn't remember me. Cole, I shot her... point blank. No, you didn't. I got here the same time as you. - It's not too late. - It is. Why did you agree to this? (..)2016 TvShow: 12 Monkeys Title: Lullaby Season: 2 Episode 8