At the time in which the novel is set, the Opera House boasted over fifteen hundred emplyees and had its own stables for the opera troupe of the white horses underneath the forecourt.

• 在小说开始创作时期，歌剧院宣称超过一千五百名员工，还在歌剧院的前院的地下拥有自己专门用来饲养歌剧院剧团的白马马厩。