FILM SANDWICHED IN: Back-to-Back (1959-105 min.). Author Sir John Mortimer, creator of Rumpole of the Bailey, was born on April 21, 1923. We celebrate his birthday with this set of two comic one-act plays. In “The Dock Brief,” an incompetent lawyer prepares to defend a man who, by his own admission, is guilty of murdering his wife. In “What Shall We Tell Caroline?,” a foul-tempered but loving man seeks to shelter his wife and daughter from the realities of life. Sir Michael Hordern, George Rose and Jean Marsh star. 12:10 p.m.