If only for the comedy glory of Sigourney Weaver as a TV network president who confuses acid reflux with gut instinct, this very smart, very funny movie about the making of a network sitcom (written and directed by bona fide insider Jake Kasdan) is a cut-glass gem of a showbiz conceit. But that's not all: You also get a crackerjack cast of in-on-the-jokesters, including David Duchovny as a comedy writer making commercial use of his brother's suicide, and Amazing Grace's Ioan Gruffudd as the BBC expat brought in to class up the joint.

