Paula McFadden knows: In sentiment, entertainers all adhere to a similar stage guidance: Exit. Abruptly, her entertainer sweetheart split today for a film job and rent their Manhattan condo. The new occupant’s name: Elliot Garfield. Calling: entertainer. Richard Dreyfuss and Marsha Mason convey satire, zingy repartee and unpleasant to-best sentiment in The Goodbye Girl.