It takes a certain kind of actor — self-deprecating, sly — to deliver Alan Rudolph’s preposterous, woozily romantic dialogue. Keith Carradine excels at it; so does Genevieve Bujold. Here, only Christie, Oscar-nominated for her performance as a former B-movie star, seems at ease. The others — Nolte as her lascivious husband, Boyle and Miller as an unhappy yuppie couple with whom the older pair becomes entwined — look vaguely pained as they recite such improbable lines as ”Impossibilities, Donald! I’m excited about the impossibilities of things!” Yeah, sure you are. Alternately silly and mawkish, the film works only when Christie is on screen; if anything’s glowing, it’s her.