Pyramids of Mars - Outside References

Outside References

The Doctor, Sarah and Laurence Scarman hide in a priest hole in the priory. This is an anachronism that even the Doctor comments on, since priest holes were a feature of the Elizabethan era and earlier, and not of Victorian architecture ("A priest hole? In a Victorian Gothic folly? Nonsense!"). The puzzle in which Sarah is imprisoned in a tube is a variation of the classic logic puzzle, Knights and Knaves.