The scene at the beginning of the episode, in which Bigfoot and Druitt are talking to each other, is one of the rare meetings between those two characters on camera along the series, as both are being played by the same actor (Christopher Heyerdahl).
During the autopsy, Magnus says the subject is some sort of human-walrus hybrid. Watson's response, "Koo-koo-ka-choo", is probably a reference to the song "I Am The Walrus" by The Beatles.