Date: Near the start of the episode, there are many comments about the heat, but there is also a comment about the weather in the English Channel being choppy and coats are worn in some sequences. The Biters Bit requires this episode to be after the Henley Regatta (July 5th-8th this year). It is no later than the start(ish) of August because of the dating of The Vanishing Lady.

Goof: The "Olympic" poster appears again (2'32") – see the Factfile for Birds Of A Feather.

Goof: Maria Charles: "... and by the following Tuesday teatime, he'd been gathered to my... to his rest, my Jack had." (7'15")

This episode (and the subsequent one) contains one of the only tangible links back to the original Upstairs, Downstairs series, when the Bellamys' Rolls Royce Silver Ghost is brought in for a service at the Watkins' garage. A chauffeur accompanies it from Eaton Place but we don't see him or learn his name. "Old man" Bellamy and Lady Marjorie get a mention too.

The first song heard in the pub (at 11'07") is Hold Your Hand Out Naughty Boy (written around 1913 by CW Murphy and David Worton).

The second song in the pub (11'44") is I'll Be Your Sweetheart (written in 1899 by Harry Dacre).

The third song in the pub (16'37") is My Bonnie Lies Over The Ocean, a traditional Scottish folk song.

Goof: The number plate on the Rolls Royce is MN 1910, but this does not match the number plate seen in the original series (see The Property of a Lady, where it is LK 7105) (20'54").

Thomas background: His middle name is David (25'59").

The song in the pub at 26'36" is The Man Who Broke The Bank At Monte Carlo (composed by Fred Gilbert in 1892).

Goof?: Sarah's shaved armpits probably owe more to 1978 than 1911 (28'08").

Goof: When Sarah enters the buffet at 43'01", she has a scarf tied around her head that is not visible in the scene before.

Goof: The cases on the back of the car (45'24") seem to have white stickers on them that were not there earlier at 33'46" (but perhaps they were stuck on afterwards by Thomas?)

Goof: The use of the postal district "NW6" is anachronistic – the numbering scheme for sub-districts (i.e. the digit "6" in this case) was not introduced until 1917 (48'34").