OK here’s my personal fantasy about the making of the Abominable Bride. Because you must have noticed, there was no Vinette Robinson (Sally Donovan, Lestrade’s sergeant). Why not? Did the writers miss Sally out because there were no black people in the nineteenth century? {insert eye roll here}
No: my theory is that the part of Watson’s random inefficient servant girl Jane was originally written for Sally. And then Vinette Robinson (in my head anyway) read the script and went “you want me to be a maid? Who isn’t even any good?? Because she’s too busy fangirling S/W??? And then she puts on a Klan hood as part of the Evil Female Conspiracy???” And then in my head Vinette said many, many blunt anglo saxon words to Messrs Moffat and co and departed into the night. Possibly twirling a cape.
As I said, personal fantasy. (OMG I’ve committed RPF!)