The subsequent series, Power Rangers Samurai (2011), reveals that RPM takes in an alternate dimension wholly separate from all the other Power Rangers series. It was later followed by Power Rangers Dino Charge (2015).
The series originally had a MUCH darker ending (at least allegedly- no one is sure whether or not this is real). After Venjix was destroyed in Danger & Destiny, the series' true finale Ranger Black would begin; Dillon would be revealed as a cyborg sleeper agent created to infiltrate the Rangers, gain their trust/access to the morphing grid, and ultimately serve as Venjix's final host. Everything about his human existence, up to and including Tenaya being his sister, was fiction created by Venjix in order to lure the Rangers into trusting him. The series would then end with the rest of the team being forced to kill Dillon in order to save humanity and destroy Venjix once and for all.
The first series since Power Rangers Lightspeed Rescue (2000) where the opening credits features the Rangers' full names.
Executive producer Eddie Guzelian was fired over disagreements he had with Disney midway through production on the series. Disney disliked his plans he had for ending the series (contrary to rumors saying that he was fired for the show going over budget), and hired Judd Lynn to finish out the series.