This is the first crossover episode for Henry Danger and the second for The Thundermans. While it's the second crossover episode of a Dan Schneider show (the first being iParty With Victorious, a crossover between iCarly and Victorious), it's the first time a Dan Schneider show has been crossed over with a show by another creator (in this case, Jed Spingarn); however, only Henry Danger writers worked on this episode. The Thundermans had a crossover with The Haunted Hathaways and The Thundermans called The Haunted Thundermans.
Previous to becoming the star of Henry Danger, Jace Norman appeared as "Flunky" in The Thundermans, episode "You Stole My Thunder, Man" [#1.8] (where Max wins the class presidency). In both appearances, Jace's characters have a crush on Phoebe.
When asked to disguise herself as a Muchacho (one of three Spanish criminal siblings from Canada), Charlotte says she doesn't know anything about being Canadian. Riele Downs, who plays Charlotte, is Canadian.
This episode was produced from November 2 to November 13 of 2015. It took two weeks to produce due to being a 2-part episode.
With only The Toddler, Van Del and Dr. Mynyak (and Max) atop the moving train, the fate of the other villains (The Time Jerker, Drill Finger, Nurse Cohort and Jeff) is unknown. They would be fugitives.