Clips of Holmes and Moriarty's fall at the Reichenbach Falls from The Final Problem are used in this episode.
Jude Law plays a minor character in this episode - believed to be his first ever screen appearance.
The dead nurse in her coffin is shown in two different scenes. In BOTH she is visibly breathing and in one the ribbon around her throat is visibly moving with her pulse.
The end titles for this episode appear over a still image of the Cornish coastline.
Last episode to feature David Burke as Doctor Watson.
The opening title music for this episode is changed to a more sombre and distressing version.
The end credits roll up against a black screen next to an image of Sherlock Holmes and Professor Moriarty falling into the Reichenbach Falls.
The end credits for this episode play across a scene where Doctor Watson is deciding what title to give to the latest case.
First appearance of Colin Jeavons as Inspector Lestrade.
The end credits for this episode appear initially over a scene as John Hector McFarlane returns to his family home.
This episode features the first of four appearances by Charles Gray as Holmes' brother Mycroft.
The end credits for this episode begin over a view of Holmes walking away down a misty railway platform.
The end credits for this episode appear over a reprise of Holmes attacking Roylott's swamp-adder.
The end credits for this episode begin with a shot of Henry Wood sitting by a fire and finish with a montage of drawings showing the events of the story.
In a change from the usual format, this episode's end titles play as the camera pans away from the Cubitt house, as the characters depart.