Jason Momoa and David Hewlett starred together in Stargate Atlantis
The title of this episode is part of the phrase "Heavy hangs the head that wears the crown". This comment on the responsibilities of royalty is often attributed to "Henry IV, Part II".
At 28:30 when Tormada says "I have miles to go before I sleep" he is quoting the final line of poetry from Robert Frost's "Stopping by Woods on a Starry Night".