Plot hole: In the last series, a point was made that the time drive is not a teleporter, so can only send them backward and forward in time in the one location (Deep Space). So in this episode, how can they now travel to Earth with the same device?
Plot hole: The man the crew find stampeded to death had been lying in the road for a year, yet he had not began to decompose. (00:17:50)
Answer: It's Queen Victoria, someone any Englishman would recognize, and needed no introduction.