Continuity mistake: When John first explains how to rescue the little girl in the hole, he wraps his left hand around his right wrist, but in the next shot it's his right hand that's around his left wrist.
Continuity mistake: While John's lying in the lateral tunnel when digging to reach Helena, his entire uniform is covered in dirt, but when John pulls her out and is with Roy in the rescue shaft, John's uniform is only a little dirty, nowhere near as filthy as it was just moments before.
Answer: On IMDB, actress Anne Schedeen is listed as playing Nurse Carol on six episodes from 1974-76.
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