Director and star George Clooney teams up with Renee Zellweger for "Leatherheads,” an ode to the early days of professional football and screwball comedies. While there is considerable charm on display, "Leatherheads” never coalesces into a film worthy of the genres and movies it so warmly emulates.

Clooney stars as Dodge Connelly , an aging football player at a time when pro-football barely existed and was mo...