Christopher Lambert is a traumatized former musical star who discovers a beautiful genie in a pot on the beach and falls in love with her in "Priceless Beauty," which films in Sardinia next month. . . . Katherine Helmond is an owner of a run-down metropolitan hotel who tries to make urban renewal profitable in "Mona," an ABC comedy pilot now casting in Los Angeles. . . . Patrick Cassidy is a yuppie computer executive unjustly sent to prison who joins convicts David Hemmings and Bruce Young in an elaborate escape in the NBC movie "Three on a Match," now shooting in Huma, La. . . . John Lithgow and Teri Garr both think they've killed the same man who appears in Garr's freezer in the comedy film "Stiffs," which shoots in April in San Pedro. . . . Nicholas Pryor, a regular on the new Ed Asner series "The Bronx Zoo," invents the A-Bomb in the ABC miniseries "War and Remembrance," which continues shooting next week in Barstow. . . . Kelly McGillis plays a lawyer defending a woman raped in front of witnesses who fail to come to her aid in an untitled drama that Jonathan Kaplan directs for producer Sherry Lansing in Vancouver, Canada, on April 26.