Though shown as the second episode, this was actually the ninth episode filmed.
The entrance to the mine clearly uses the same set as the basement in 'The Night of the Inferno' (S01E01).
The shot where a dying Captain Jackson mutters his last word, "Flory", seems to all intents and purposes to be an homage to the scene in CITIZEN KANE where Orion Welles mutters his last word, "Rosebud".
Barbara Luna's character Gatita is the only person who ever called James West "Jimmy".
The opening shot includes a charred fragment of a crate stenciled "Casa Estrella, Quemada", which was destroyed in Season 1, Episode 1.