When Rick and Jerry look into the talking cat's mind, one can hear audio samples of people screaming from the movie Event Horizon (1997).
Liam Cunningham (Balthromar) is best known for his role on Game of Thrones (2011), a show that features dragons.
Balthromar has a Tesla Model S in his pile of treasures. Ironically, the preceding episode, One Crew over the Crewcoo's Nest, featured Tesla CEO Elon Musk.