Nenhuma razão é dada.

O fato é que o "V.R." é tirado de uma descrição feita pelo Dr. Watson sobre os maneirismos de Holmes do The Musgrave Ritual de A. Conan Doyle

I have always held, too, that pistol practice should be distinctly an open-air pastime; and when Holmes, in one of his queer humors, would sit in an arm-chair with his hair-trigger and a hundred Boxer cartridges, and proceed to adorn the opposite wall with a patriotic V.R. done in bullet-pocks, I felt strongly that neither the atmosphere nor the appearance of our room was improved by it.

Basicamente, Holmes fez isso porque ele sentiu que .

Os cineastas simplesmente adicionaram o canon set dressing