When asked his favorite Christmas movie by reporters at the City Hall Christmas party, Oliver Queen's answer is 'Die Hard.' The actor that plays Oliver Queen, Stephen Amell, has stated multiple times that his favorite Christmas movie is Die Hard and he persuaded the Arrow writers to throw it into the episode.
The free running flip that Prometheus performs, is known as an Aerial Twist or A-Twist.
This is the first episode of the whole series that Quentin Lance (Paul Blackthorne) does not appear in.
At the end of the episode when green arrow is in the building to find prometheus,the stairway is the same as seen in the series Van Helsing.
The voice of Prometheus is provided by Michael Dorn. Dorn portrayed Worf on Star Trek: Deep Space Nine, in which the final episode was called What You leave Behind.