On the road to King Richard's castle, a signpost states that Valencia is to the left, Winterfell is to the right, and Hell is down.
When the trio reaches the fork in the road, the sign to the right says "Winterfell." Winterfell is the castle belonging to the Starks in "Game of Thrones."
WILHELM SCREAM: During the "Stand Up" montage, when one of the knights falls off his horse.
John Stamos' character is named "Jean Hamm," most likely a reference to actor Jon Hamm.