November 6, 1985

The movie ''Krush Groove'' is a somewhat slapstick comedy filled with song and dance and containing little violence, yet on several occasions violent incidents have broken out following a showing. The most recent of those incidents occurred last weekend in this Nassau County community not far from the Queens border. The police say that as many as 225 teen-agers may have been involved in the fighting. ''Krush Groove,'' which is about black teen-agers in New York City who start out washing cars and end up signing recording contracts, has been drawing a predominantly black audience, according to theater owners. The clashes on Long Island appeared to be between them and the largely white audiences attending other films at adjoining theaters.

To American intelligence officials, Vitaly Yurchenko's defection had seemed an extraordinary coup, a signal that the tide in the ideological war was turning in favor of the United States. Just last week, officials were calling Mr. Yurchenko a new breed of defector who left because he was disillusioned with Communism, not because he was in trouble or in debt. Before his redefection, a White House official, speaking of Mr. Yurchenko and other recent defectors, said, ''It certainly has caught the attention of senior people in Government, the difference between these cases and the ones of the past.'' But today, officials at the Central Intelligence Agency said they were stunned and perplexed.

Gencorp Inc., which was once known as the General Tire and Rubber Company, said yesterday that it would ask its board to authorize the buyback of ''a significant'' portion of its stock, using some $700 million in pretax proceeds, principally from the sale of two television stations. RKO General Inc., a division of Gencorp, has agreed to sell KHJ-TV, a Los Angeles independent television station, to the Westinghouse Electric Corporation for $310 million, Gencorp said. RKO is also exploring the sale of WOR-TV, the New Jersey-based station that covers the New York market. That station, which Westinghouse is also interested in buying, could sell for $300 million to $400 million. The company has additional funds coming from its agreement last month to sell its stake in Frontier Holdings Inc., an airline holding company, to People Express for $300 million.

DURING their years in the service, some had not yet come to realize they were homosexuals. Others were aware of it but kept the matter to themselves or confided in the few others in the same situation. To acknowledge it, they knew, could abruptly end their military careers. Now 10, 20 or even 50 years after they were mustered out, much has changed for many of America's homosexual veterans. They not only want to acknowledge their sexual orientation publicly but to proclaim their patriotism at the same time -by marching down Fifth Avenue, under the banner of the Gay Veterans Association, in the annual Veterans Day parade.

In perverse moments, Herbert M. Sandler almost wishes interest rates would rise. That is an extraordinary musing for a thrift unit officer such as Mr. Sandler, chairman of the Golden West Financial Corporation, a $12 billion savings and loan institution based in Oakland, Calif. Higher interest rates would raise the price that thrift units pay for money at a time when hundreds of them around the country are already fighting for survival. But Mr. Sandler would not mind showing ''how far we've come.'' That is because, while the public perception is that the industry is on the ropes, many thrift units, including Golden West Financial, are earning record sums this year, and are also restructuring their balance sheets to reduce their vulnerability to a new round of higher interest rates.