It’s an outlandish premise, but director Frank Oz knows how to build the jokes until the farce reaches full comic boil. Murphy’s strung-out star is an incendiary delight, and he doubles the fun playing his own brother, the sweet, not-so-swift Jiff. “Bowfinger” may not be as subtle as “Roxanne” and “L.A. Story,” also written by Martin, but like them it supplies an indecent amount of fun.
