Factual error: When Holmes is on the mantelpiece to examine the cut bell rope, you can see a telephone line against the wall; it has been nailed to the top of the wainscoting with two standard white cable clips.
The Return of Sherlock Holmes (1986)
1 factual error in The Abbey Grange
Starring: Jeremy Brett, Rosalie Williams, Edward Hardwicke
Factual error: Holmes and Watson walks through a colonnade. Clearly visible in the background right over Watson's head is part of a 20th century circular red and white road sign. (00:34:18)