It was said, after Mary was executed at the Castle of Fotheringhay, that her lips continued to move for fifteen minutes after her head was separated from her body. The claim was repeated in this recreation of events, from Elizabeth R starring Glenda Jackson in the title role.
Mary, Queen of Scots, is portrayed by Vivian Pickles in this BBC series (which first aired in 1971).
See, also:
Mary, Queen of Scots - Bad Decisions and a Lost Throne
Trial of Mary, Queen of Scots
Credits
Clip from Elizabeth R, starring Glenda Jackson as Elizabeth I, online courtesy BBC.
Original broadcast, 1971. DVD released, October 16, 2001.