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. While others theorize that the changes in the past resulted in a different upbringing for Alex which led to his colder personality. 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.
Ear Worm: The theme song, as per every Power Rangers season.
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.
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.
They briefly use a clip of Naoto's first morph into Time Fire in place of Erik's morph into Quantum as the actors are so similar looking that in shadow they look the exact same. The downside is, the morpher clearly still says "FIRE" on it.
Unintentionally Unsympathetic: Though Ransik is well-liked by fans for being a sympathetic Anti-Villain who was Driven to Villainy by the Fantastic Racism of humans against mutants like him, some fans unfortunately view him as this since other characters claim that some people did try to reach out to Ransik, but he rejected them. Additionally, a flashback shows he mortally wounded Dr. Fericks who helped him by giving him a serum to help the pain of his mutations, and laughed at his charity as foolish, though Fericks survived by becoming the cyborg Frax. Furthermore, Ransik never shows any desire to help other mutants or make conditions better for them, and takes his vendetta a thousand years into the past where he just causes chaos for the sake of doing it. It makes one wonder how much of his posturing is sincere, and how much is just him excusing himself.
Conversely, other fans see Time Force themselves as this for propping up the racist government that makes threats like Ransik possible. In the Sentai source material, the Rangers' superior (the analogue to Captain Logan) is actually the true Big Bad of the show, and as such it's very easy to spin the main characters' bosses as villains.