He reshaped his hat, and I think his walk, and if I'd blinked I would have thought for a second it was a different actor coming into the store.

He lightens his voice, too, and does some nervous things with his hands, and I agree with you. I really think Bogart is underrated as an actor, he's such an icon. His body language is half his characterization in The Petrified Forest (1936).