Philip Casnoff, the lead actor in "Shogun: The Musical," was injured during a preview performance Tuesday night at Broadway's Marquis Theater when a prop fell and knocked him out. A large Japanese shoji screen fell on Casnoff just as he was about to begin a song titled "Death Walk" and knocked him into the orchestra pit.

The accident, in which Casnoff suffered a slight head wound, forced the cancellation of yesterday's matinee and evening performances, but after consulting with Casnoff and his doctors, the show's producers announced that tonight's performance would go on as scheduled. It will not be the official opening as planned, but a continuation of previews, and the opening is now set for Tuesday. Casnoff, who took over the part from Peter Karrie after lukewarm reviews during the show's recent Kennedy Center tryout, said in an interview from the hospital that although there was "a lot of pain in my shoulder and neck," it didn't look like there was any permanent damage.

A Bow to Bernstein There was a midday concert yesterday at New York's Carnegie Hall in memory of Leonard Bernstein, who died Oct. 14. Bernstein's daughter Jamie Thomas said during her reading that her father loved musical coincidences, "and today there's a flock of them." It was the 47th anniversary of Bernstein's electric New York Philharmonic conducting debut in the same hall, the 36th anniversary of Bernstein's television broadcast debut and the 90th birthday of Bernstein's good friend composer Aaron Copland.

First-chair musicians from orchestras around the world came to perform in the orchestra, which played, among other selections, excerpts from Bernstein's "Mass" and "Chichester Psalms." Guest conductors for the program were Michael Tilson Thomas, Michael Barrett, Christoph Eschenbach and James Levine, but when the orchestra played the overture to Bernstein's "Candide," the podium remained symbolically empty, bringing tears to the eyes of the audience and a standing ovation. Other performances yesterday came from cellist and NSO Musical Director Mstislav Rostropovich and singers Marilyn Horne, Christa Ludwig, Thomas Hampson, Jerry Hadley and Chester Ludgin, with readings from Lauren Bacall, former Columbia University dean Schuyler Chapin and family members.

Rolling Stone Hit by Car Rolling Stones guitarist Ron Wood suffered two broken legs Monday after being hit by a car near Newbury in southern England. "Woodie," 43, was trying to direct traffic around his limousine, which had just crashed without injuring him, when he was hit. He was in good spirits in the hospital, saying that doctors had prescribed "a pint of Guinness {beer} a day." He was lucky to escape from the accident with his life, according to witnesses.

John Heckler Injured John Heckler, former husband of Margaret Heckler, onetime secretary of health and human services, was paralyzed from the chest down after he fell from his horse during a fox hunt last weekend in Middleburg. Heckler, who publishes Spur magazine with his wife, Sheryl Bills Heckler, is in stable condition and is expected to leave Fairfax Hospital by this weekend. Doctors had no comment on his prognosis.

Picassos Returned to Spain French President Francois Mitterrand is following the wishes of the late Pablo Picasso and returning two of the master's paintings to Spain. At a summit meeting in Paris on Tuesday, Mitterrand presented the paintings to Spanish President Felipe Gonzalez saying, "This gesture affirms one more time the links of friendship between our two peoples." "The Rooftops of Barcelona" and "Homage to Spaniards Killed for France" were part of the Spanish-born artist's personal collection, paintings that he stipulated in his will should be returned to his native country.