Alternate Character Interpretation: A decent sized amount of the fanbase feel that Ransik's in the right here; at the very least, the government he's rebelling against definitely seems to have some creepy aspects that are never really addressed.
There are theories going around that Alex being revived after being killed in the first episode was probably a pretty traumatic experience for him (some theorizing that he actually remembers being dead, and this is what caused him to act so coldly towards the team when he comes back. There are also theories that he was never going to erase the Rangers' memories in the finale, and was merely testing their resolve, but while he knew that the Rangers would go back to 2001, he was completely caught off-guard by Jen returning her engagement ring to him.
Awesome Music: A lot of the BGM in this series just kicks ass- especially the music from the first formation of the Megazord.
Call Forward: To Power Rangers S.P.D. which takes place 20 Minutes into the Future, as opposed to the current year or the the year 3000, but also features a team of law enforcement rangers who imprison rather than destroy the MOTW's they defeat. Both series involve a setting where humans, aliens, and mutants coexist on Earth, though not always peacefully.
Draco in Leather Pants: Fans seem to treat Ransik as an Anti-Villain due to his sympathetic origins when this is not the case; prior to his redemption he is simply a sadistic, murderous criminal. In other words, his reasons for becoming a villain are sympathetic, but his actual motives and actions as a villain are not.
He experienced prejudice and hatred in the future due to his being a mutant, which caused him to become a villain. But his actions as a villain seem to have little to do with that - he isn't some kind of misunderstood freedom fighter trying to get rights for mutants. His plans aren't even motivated by the idea that massacring the humans would prevent mutant discrimination either - he just wants to cause mayhem and kill innocents.
Ear Worm: The theme song, as per every Power Rangers season.
Leaning more to the Astronema/Karone side of this, she has an evil father figure who's fiercely loyal to her, undergoes a Heel–Face Turn initially brought on by maternal instinct, has fallen for and dated one of the Rangers, is nearly killed on accident by a family member in the season finale, and ultimately becomes a Friend to All Children after reforming.
Hilarious in Hindsight: The Mighty Morphin' Power Rangers episode that involved a Time Capsule in which the rangers talk about their hopes that the world of the future will have no wars, no violence, or prejudice becomes this with regards to how the year 3000 is. Linkara even lampshaded the irony with his "History of Power Rangers" episode involving Time Force.
Harsher in Hindsight: Near the end, Mr. Collins dies but is revived by Alex. 5 years later, Ed Albert died in real life due to lung cancer.
What happens to Frax in the finale is pretty much a lobotomy.
He Really Can Act: Put Jason Faunt and Erin Cahill on screen together, you will get magic every time. Toss in the likes of the late Ed Albert, Vernon Wells, and Dan Southworth, and you get one of the best ensembles in PR history.
Ho Yay/Foe Yay: Wes and Eric. They act like they had a bad breakup a while back.
Idiot Hero: When the Rangers are trapped in the movie dimension, they are forced into doing whatever Cinecon's script says, and Cinecon says he'll destroy them and their Megazords as it says in the director's script. But, Trip took the script's last page early on (not knowing what it really was), so without the last page, the Rangers changed the ending to one where they capture Cinecon and go back to their own dimension, but only because Trip saved them by stupid accident.
It's the Same, Now It Sucks: Averted. While Power Rangers Wild Force and Power Rangers Samurai have been disliked for being close adaptations of their Sentai, Time Force is beloved despite being at least the third most faithful Ranger series to its Sentai counterpart. Perhaps because its Darker and Edgier than the other two. It's also might be because it's not almost exactly the same; there are several notable differences in terms of episode plots, how the stock footage is used, and in characterization for a few characters (most notably Eric when compared to Naoto and Alex compared to Ryuuya.
Jerkass Woobie: Eric. He's a jerk when we first see him, rejects Wes' friendship and is not much of a team player outside the Silver Guardians. Still, he had to struggle to get to where he is while his old friend seemingly got everything handed to him. And for all of his sternness, Eric is a much nicer person than he lets on.
Frax, as well, once you learn his backstory.
Narm: Mr. Collins learned Wes is the Red Ranger when his visor shattered. The performances between the two in the resulting exchange were strong but rendered a little silly because Wes' voice was muffled from the helmet being in the way. That, and the broken helmet didn't fit very well and his nose kept poking out of the hole.
Nadira's "mutants can love too, daddy!" speech in the finale.
Nightmare Fuel: Everything that happens to Frax in the finale, but especially his death, when his face falls apart.
Squick: The way Ransik pulls his sword from his body, that's just creepy.
Hell, de-masked Ransik's appearance in general. Euuuuuuuugghhhh...
Stock Footage Failure: Sentai stock footage is used in several scenes important to the plot. It doesn't cause plot holes because of the similarities, but several critical scenes have Wes suddenly turning Japanese.
They very clearly use the same fight scene twice at different points, and there are of course the classic scenes where a building will have one floor on Japan and the next in Silver Hills.