Delex turning humans into green-slime-batteries echoes back to DOGGED where Rhinix transformed humans into green slime energy fluid.
Jack arresting Ally as a Robin-Hood-like street robber who provides clothes for the poor echoes back directly to himself in BEGINNINGS PART 1 and PART 2 where he was arrested for that very crime and subsequently coerced into joining S.P.D.
This is the first episode of the season that can be structurally regarded as two short stories of equal length running consecutively. The first segment (that can be distinguished as "Confrontation") deals with Jack finding an interest to pursue outside of S.P.D., which leads Cruger to dress him down when it clearly interferes with his Ranger duties. The second segment ("Resurrection") deals with the discovery of the long lost and presumed dead 'A' Squad S.P.D. Power Rangers. These are two distinct ideas that are not integrated, merely connected at the center.
This episode contains the show's only reference to C-Squad.
The A-Squad are found on Gamma Orion, the location that Mirloc was being held originally.