This is Barnabas's first experience with time travel. He seems to be taking to it like a duck to water.
I liked the way the drawing room was completely dark so they wouldn't have to change the furniture.
I was impressed with how Barnabas remembered his conversation with Nathan Forbes at the Eagle, which happened nearly two hundred years ago, as far as Barnabas is concerned. I figured that Barnabas must have spent some of his coffin nights between 1795 and 1967 recalling that conversation with relish, or even jazzing it up a bit. Or maybe the original course of events had some sort of pull on him, and he found himself saying the words willy-nilly, and even had a hard time going off-script.
When Ben told Nathan how to kill a vampire, that seemed strange. It just didn't come out as naturally as it did originally. Maybe he was compelled by the original course of events, and felt strange doing it.