When Katana returns home through the time portal, a ball of light emerges from the portal. It isn't clear to the viewer if this is some manifestation of Katana's essence or a new entity or something else. It is something that will haunt S.P.D. and the Rangers until what it is becomes clear in The Messenger Part 2.
Katana's Sensei is played by Ryuuji Sainei, who played Banban/DekaRed in Dekaranger, the original Japanese counterpart of the show.
Unlike the episode's counterpart where Red leaves but is stopped by the boss, Banban and Doggie do not have a big conversation as Jack and Cruger does.
This episode takes place in 2025.