The management of the Door, a Georgetown nightclub featuring live entertainment, canceled two evening shows last night featuring comedian Don Novello, a k a Father Guido Sarducci, because Novello apparently never knew about the booking. Novello's 8 o'clock show had sold out and tickets for the 10:30 show were selling briskly. Novello is best known for his appearances on television's "Saturday Night Live."

"Don evidently never knew about it," said Paul Kurtz, owner of the Door. "I was under the impression that I had a date confirmed with one agency . . . I don't know if that was accurate or not.

"It was just a colossal screw-up, a total misunderstanding," Kurtz said.

"They may have had a sold-out show, but they never had an act," said Lou Viola, who identified himself Tuesday evening as Novello's manager. However, reached yesterday afternoon, Viola said his company no longer handled Novello.

"I found out about this last night," said Fran Saperstein, Novello's personal manager, with the Brillstein Co. in Los Angeles. "That date was never okayed . . . We were upset and Don was upset because he cares about his public. You don't mess with Father Guido's public. The first thing he said was, 'This is gonna look terrible. It's gonna look like I backed out.' "

Novello, who was flying from New York to Los Angeles, could not be reached for comment.