First, in "Sherlock Jr.," movie theater projectionist Buster Keaton enters the film he's running in order to solve a jewelry theft. Co-stars Kathryn McGuire, Ward Crane, and Keaton's father, Joseph. Then, Keaton spoofs D.W. Griffith's "Intolerance" in his debut feature "Three Ages," as he competes with rival Wallace Beery for the hand of Margaret Leahy in caveman days, Ancient Rome, and 1920s America. 108 min. total. Standard; Soundtrack: Dolby Digital stereo music score; audio commentary; featurettes. Silent with music score.