When the hound attacks Selden, during the struggle there are scenes in which the victim changes from Selden to Sir Henry Baskerville. Seldon's head is shaved, while in parts of this scene, the victim obviously has a full head of hair.
When Sherlock is reading the warning letter at the Northumberland hotel, he reads it as "If you value your life and reason, stay away from the moor." Yet the first word on the letter is "as."
At the end, Holmes tells Watson "I have tickets for Les Huguenots at Covent Garden" (the Royal Opera House). The subtitles on the DVD show it as "Cover Garden".
This adaptation makes the usual error of giving Watson a Webley Mk VI .455 service revolver. Though it has the "look" of a 19th century revolver, it was not fielded by the British Army until 1915, almost thirty years after the story is set.