Such weighty matters as the showing of whatever is "too much" busts, bottoms and bumps by cheerleaders, plus the possible commercialization of it by some clubs, will be discussed at a special National Football League meeting here Oct. 4.

The problem has become a serious matter of image since reports that Playboy magazine has engaged some cheerleaders to pose in the nude. Two clubs, Oakland and Dallas, have provisions in their contracts prohibiting that, but there is little they can do about former cheerleaders.

A league spokesman said yesterday protest mail had been received. Usually, mail comes from parents saying their youngsters look up to coaches, players and others as examples to follow.

Last year, Commissioner Pete Rozelle reacted to concern about violence on the playing field by issuing a memo warning of drastic penalties if it continued.

The NFL has been on the defense for the past couple seasons, most recently over incompetent officiating revealed by instant television replays. The league has been experimenting with ways to improve officiating and that topic also will be discussed at this meeting.

A league spokesman acknowledged yesterday that a preliminary examination, pending a full review, indicated officials were wrong Sunday in not ruling that Larry Anderson of the Pittsburgh Steelers had fumbled away the opening kickoff of overtime to the Cleveland Browns.

THe Steelers went on to score a touchdown, beating the Browns, 15-9.

Ownership of a team in a sport other than pro football will be another important item on the meeting's agenda. There is new concern since Al Davis, managing general partner of the Raiders, helped an Oakland group try to buy the Oakland A's baseball team.

The league has had a long-standing, but ignored, policy against dual ownership, but there has never been a timetable enforced to compel owners to decide between pro football or another sport.

Jack Kent Cooke, majority stockholder in the Washington Redskins, for example, owns the Los Angeles Lakers and Kings. He has agreed to dispose of the Redskins or the other teams whenthe court in his divorce case unfreezes those assets.

Lamar Hunt, founder of the American Footballe League and owner of the Kansas City Chiefs, also owns a Dallas soccer team and has an interest int he NBA Chicago Bulls.