Plain Clothes

On-screen credit for Capra and an on-screen spelling out of the "clueless about most everything" he saw as Langdon's hook. Capra held that silent comedians need a defining characteristic; as he saw it, Keaton stoically suffered, Lloyd quickly outran his troubles, etc. and Harry here was a big old naive baby. Last I checked, Keaton could book it pretty fast too, but that's not here nor there, as Langdon comes on clueless like gangbusters. Romance or raiding, this kid's just along for the ride.