This is the only episode from the series to be 79 minutes in length. The remaining ones are approximately 50 minutes each.
The series uses Dimitri Shoshtakovich's "The Gadfly Suite" as a theme song.
This episode shows Reilly and Margaret Thomas meeting for the first time in Russia in 1901, but in fact they met in England in 1897 and married the following year after her husband's death.
This episode takes place in 1901.
Directorial duties for this mini-series were divided between Jim Goddard and Martin Campbell who both directed six episodes each.