I thoroughly enjoyed it too, the best film I've seen at the cinema in a while.
It was Evan writing in his journal under the desk, the same place where he watches the cine-film you see him doing at the end of the film. However, I think the dialogue is slightly different, and I'm not sure how obvious it is. Maybe I'm wrong, I don't know.
Yeah it's very Donnie Darko, but I thought it was more like the work of the directors. I believe they wrote Final Destination 2, and the idea of changing the course of nature is a trait of theirs.