Jay Baruchel would, without a doubt, be the perfect pick for Weasel. Watching any other actor play him would just feel like bathing in someone else's bathwater. Wrong.
Even Charlie Day wouldn't be right because it wouldn't feel like Weasel, it would feel like Charlie Day. I want to watch Charlie Day in a film out of his comfort zone. I want to see him as the star of a serious action or thriller like I want to see Jason Statham in a Rom/Com. I'm serious, I want both those things.