After examining the telescope, Queen Victoria says that, her late husband, "Prince Albert himself was acquainted with many rural superstitions, coming as he did from Saxe-Coburg", to which the Doctor whispers Rose: "That's Bavaria". Actually Saxe-Coburg is located in Thuringia, though next to Bavaria.
Queen Victoria is shown being escorted by soldiers from the Scots Guards. Since 1788, the British Sovereign's official bodyguard has been the Life Guards. In Scotland in 1879, Queen Victoria would have been escorted by the 2nd Troop (Scots), 2nd Regiment of Life Guards.
It is *extremely* unlikely that armed soldiers on guard over the room holding some precious object, told to "defend it with your lives", would accept any food or drink from a person unknown to them without approval from a superior officer.
The goof item below may give away important plot points.
At the end of the episode, the Doctor and Rose are speculating as to whether the hemophilia in Queen Victoria's descendants was actually a result of the Werewolf bite she received. However, her son Leopold had been diagnosed with the disease in early childhood, 2 decades before this episode takes place. The Doctor also incorrectly implies that Queen Victoria has hemophilia, when she is only a carrier of the disease.