“A matinee of ‘The Little Dog Laughed’ was delayed on Sunday because the show’s star was at Bed Bath & Beyond buying mattress pads.” The Broadway play, in previews, had pushed its regular 3 o’clock matinee up to 2 o’clock. “The audience understood the new schedule. So did the stage manager, and the director, and most of the actors. Just about everyone did except for the play’s star, Julie White. ‘It gets to be about noon, which is the time I would start getting ready to go to the theater for a 2 o’clock,’ Ms. White said yesterday. ‘And I think, “Oh wait, I have a whole ’nother hour, and I hate my mattress pads!” ‘ “