Harold asks, "Who the hell is Frank Robbins?" Frank Robbins was an illustrator for Marvel. At one point he did art for Power Man (Luke Cage) a fellow Defender.
In the final moments of the episode, Claire utters the phrase "sweet Christmas!" This is a phrase often used by Luke Cage.
This is the only episode in the show where all the main characters, including Claire Temple, appear in the same episode.
On the final moments after leaving the dojo, a rat "extra" in the midground runs into the scene. It is conscientious enough to realize its error and runs back to hide in the shadows once more.
Two of the main actors in this episode are connected to "Doctor Who." Finn Jones (Danny Rand) was in the Doctor Who spin off The Sarah Jane Adventures (2007) as the grandson of Jo Jones, and Sacha Dhawan (Davos) played The Master in season 12 of Doctor Who (2005).