Dawson Casting: The show establishes that the ToQgers are approximately the same age, having been in the same class and all; which makes it kind of funny that Jin Hiramaki (Tokatti) is 27, which would make him 11 years older than the youngest cast member Moritaka Ai (Kagura).
Minor example would be Riria (Mio), who is turning 21, while the rest of the team (sans the above mentioned) are in their late teens.
The age difference between Tokatti's and Kagura's actors was given a major lampshade by Wagon in #2.
Perhaps it's a bit of a stretch, but in Go-Onger, Carrigator was Engine #6 and orange. There wasn't a Ranger based on him, but with the same color, number, and two railway lines on his suit looking a lot like the Go-Ongers' seatbelt designs, not to mention the shovel-teeth over his visor looking rather like an animal motif, ToQ #6 ends up looking very much like a Go-On Orange would have.
Name's the Same: Get used to calling the red and blue ToQgers Ichigo and Nigo. When said Riders as well as Kamen Rider V3 meet the ToQgers in the Gaim crossover special, Mio even brings up the fact that V3 isn't called "Sango" like she is.