Corrected entry: During the "My God" number in the proper performance, one of the nuns turns to her right when all the other nuns turn to their lefts, and she looks visibly upset when she turns to face the correct direction. The actress in question appears to glance offscreen, presumably at the director to determine if they should continue, and then sets her face resignedly and continues. The actress playing Sister Mary Robert seems to react slightly as well.
DavidK93
26th Aug 2003
Correction: This is very obviously done for comical reasons. Mary Lazarus is the one who is never quite in sync, and when she realizes that she has turned the wrong way she does a kind of "Oh, no, not again" gesture. Mary Robert's facial expression seems to say something along the lines of "That's Mary Lazarus all right!" This is definitely not a movie mistake.
littlestar