hen the tape of last night's game gets labeled and filed into the Celtics' vast video collection, the team might want to break with tradition. Instead of stamping it with the date and opponent, they could title it ''Coming Attractions.'' As the Eastern Conference stands, the game between No. 4 Boston and No. 5 Orlando was a possible preview of a first-round playoff matchup. The Celtics certainly did not forget that, and it showed in their play.

They have talked about treating their remaining