Queen Victoria, Princess Victoria and Grand Duke Michael all have American accents.
Buffalo Bill should have recognized Phineas Bogg and Jeffrey Jones since he first met them in 1860 when he was a boy riding for the Pony Express.
At the start of the episode, several explosions are shown. One is an explosion of a bridge, which is reused footage from the pilot episode and seen in the opening credits.
When Jeffrey is getting a pastry a white area can be seen on the camera lens near his hat.