The pups are all seen in medieval gear for the first time.
This is the first time a character gets sick (Chase).
This is, however, the second time any member of the PAW Patrol is under Katie's medical care for any reason, the first time being "Pup Pup Boogie" in which Rubble is under Katie's care on account of a sprained paw.
It is revealed that Marshall has stage fright, especially as a last-minute substitute.
This is the first time Marshall is seen on the title card in his medic gear instead of his firefighting gear.
This is the first time Rubble uses his crane.
A crown appears on the title card along with Marshall.
The title of the title card has a castle texture.
In this episode, Ryder does not say, "Whenever you're in trouble, just yelp (or whatever is substituted) for help!"
Chase says "PAW Patrol ready for duty, Ryder, sir!" instead of "PAW Patrol ready for action, Ryder, sir!"