In "Reinforcements from the Future", one scene has Ransik (the villain of Power Rangers: Time Force) interrupting a powerful incantation by three Mutant-Orgs to try to defeat them. It doesn't completely work, but it has the side effect of nullifying the Mut-Orgs' mutant powers. Guess what happens to the half-mutant, half-human Ransik later?
In the season finale, Ransik is shown the error of his ways by his daughter Nadira and her newfound love for humankind. It's Trip who, accidentally or not, shows her not all humans are evil in the first place. In a way, it's Trip, the Innocent Alien who believed he wasn't as good as his Ranger peers, who was the first to trust Nadira despite her betraying him before, who saved the fate of the world as we know it.
The Quantum Ranger suit is a near-exact match for the Red Ranger suit, an oddity in terms of Sixth Ranger designs which typically look much different from the main team while keeping a few stylistic similarities. When Circuit talks about the Q-Rex, he mentions that it was once used when Time Force first started experimenting with time travel. The Quantum Ranger powers were likely the first developed by Time Force and therefore served as a test-bed/prototype that the other Morphers were based on, starting with the Red Ranger.
The Time Force Rangers living in a Clock Tower. What do clocks tell? The TIME.
The fake movie used by the villains in "Movie Madness, Part 1" has a fight scene in which the hero has a climactic battle with the villain while armed with a sword. Seeing as how a sword is quite an advantage for the hero to have over the villain, this is the first clue that there is something not quite right about the "movie".
Why are the Silver Guardians named as such? (Even though the original Timeranger source material names them the "City Guardians") It's because the name of the city in the official English material is "Silver Hills, Washington [State]"!
Alex taking over is seen as a bad move on his part, especially his supposedly out of nowhere antagonism towards his fellow Rangers. But consider that before Jen and the others took up the morphers, Alex was the only known active Ranger where he acted as vanguard of his personal team where no one questioned him. In many cases, he's probably sent on his own as we see from the start of the season. So he's probably going to have trouble leading a group that was commanded by his fiancée along side his ancestor.
The mutants are supposed to be frozen, some of them for life sentences. One of them mentions that he has had two years to think while frozen. Just imagine a what a longer sentence would do. This and the fact that, either way, the mutants they fight are citizens and not any kind of inherently evil force are likely why this is a strictly no killing season.
There's also the fact that, as kindly pointed out by Linkara, the Mutants are probably human beings with hideous mutations. (Thanks Linkara)
The Black Knight in "Beware The Knight". The Rangers have no knowledge of him or where he came from. Had he not attacked them in public they probably never would have even known about him and the only reason he was ever destroyed was because the Time Force Rangers came back in time. How many other monsters out there went under the radar because the Rangers don't notice them?
The parents of the baby that Nadira finds in the finale are very likely dead from Ransik's rampage.
Considering the 9/11 attacks happened during the show's run (which in turn caused reruns to beheavily edited), it's highly likely they also happened in-universe as well. Were the Rangers ordered by Captain Logan not to prevent the attacks to preserve the future timeline?
