Continuity mistake: After we see the twins push Crater-Face into the pool, we see them a couple of scenes later after Michael reveals himself as the mystery rider and we notice that the twins are completely dry.
Grease 2 (1982)
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Directed by: Patricia Birch
Starring: Michelle Pfeiffer, Maxwell Caulfield, Lorna Luft, Maureen Teefy
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More mistakes in Grease 2
Principal Mcgee: If you play an instrument, remember, it is better to play with a group then with yourself.
Trivia: The character of Brad is played by Matt Lattanzi, the future husband of Grease star Olivia Newton-John.
Answer: I don't think it is ever mentioned as to who played the two nuns. I think they're just extras.