These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Rocky: They (the Power Rangers) really reached out and touched me.
Ms. Applebee: Actually class, they really reached out and touched young people all across the world.
Alternative Character Interpretation: Zordon, a wise sage or using teenagers to fight his battles for his own possibly shady means, likely breaking intergalactic law. As for the Rangers themselves, goody-good role models for the youth of the nineties, or Jerkasses to two people (possibly with learning troubles) perceived to be bullies but only needed friends/find out the rangers' identities.
Tommy, Zordon's paladin, or someone who just wants revenge, and doesn't mind throwing his friends under the bus to do it? Does he divorce himself from the Green Ranger?
Are Bulk and Skull the typical bumbling "bad guys" you see in kiddie shows or two young mentally disable men bullied and harassed by a sociopathic town including the Rangers.
What is the Power of Thunder? Never really explained. Where did it come from? Never asked. If its always been available, why not use it sooner? Never brought up. The transition seriously gets a single short exchange of dialogue and is never questioned again.
The "Sword of Light" needed to transfer powers to another person back in Season 2 of Mighty Morphin'. Never mentioned again, and later power transfers just have the original Ranger giving their power coin/morpher to the new Ranger.
Badass Decay/Villain Decay: Name a villain who wasn't subject to this. Lord Zedd gets special mention, as he had to be toned down after the Moral Guardians deemed him too scary. (This being the popular conception of his character, ignoring the fact he was actually more successful in his schemes after his marriage to Rita than he'd ever been before)
When Tommy was introduced as a villain, he single-handedly took down the entire team. After this, he was given more power ups with each episode that only served to make him weaker. Then Rita stole the Green Ranger powers, which were only restored through Zordon giving Tommy bursts of his own energy, which made his powers unstable and unreliable before they were lost forever. Then Tommy became the White Ranger. And all was forgotten.
Don't forget Goldar, although his was more of a freefall than a decay. After "Green No More" when Tommy beat him while unmorphed, he went from The Dragon who was more than a match for the entire team, to someone who could get knocked flat on his back by an unmorphed Billy.
People don't really think of him because he was always an idiot, but Rito. When he debuted he had the same silly personality but proved why you should Beware the Silly Ones: he led a gang of monsters in the destruction of the Thunder Zords, and yes, he had help with the four other monsters, but he did most of the work himself, even delivering the final blow. He gets his ass handed to him by the Ninja Megazord (still better than the Sentai where he was actually destroyed) and after that was getting his ass kicked as frequently and as pathetic as Goldar. He even got overpowered by Rangers throwing SNOWBALLS at him (granted neither the good side or evil side could use any powers, but still. He and Goldar had SWORDS).
She didn't disappear soon enough, unfortunately. In Season 1 she could wreck the entire team on her own. In her only Season 2 appearance, both her and Goldar were simultaneously taken out by the White Ranger. Subverted in the Zord fight, though, as the two of them simply shrugged off blasts from the Thunder Ultrazord.
The Z-Putties were introduced as superior to Rita's Putties, and the Rangers initially had difficulty defeating them, even morphed. Their Achilles' Heel was quickly discovered, and over time they become easier and easier to beat. They were eventually being destroyed by children with dodge balls.
Most of the villainous examples can be more attributed to an antagonistic case of Can't Catch Up. While the Rangers were constantly getting stronger and gaining new powers, the bad guys suffered from constantly sending minor minions and Monsters of the Week to do their dirty work instead of training or progressing personally.
Big Lipped Alligator Moment: One episode had a giant Japanese boy standing next to Megazord in a scene (it made sense in the source footage but was a random scene in Power Rangers) another episode during a fight by a pool had a guy in blue tribal clothes gesturing in the background that the Rangers paid no mind too (unmorphed Zyublue in the Sentai) another episode has Pink Ranger hurrying off a Japanese girl to safety, said girl had no prior introduction and the dialog doesn't address it.
Rito: Y'know, picking out a present for you has never been easy. Remember when Mom and Dad got you that little fire-breathing dragon, but you really wanted that cute little planet, so you used the dragon to burn the house down?
Poor Kat gets it the worse. Tommy/Kim shippers keep on bringing up how they hated Kat for trying to steal Tommy from Kim, ignoring the fact that Kat was under an evil spell, and once she was free from it she stopped. Hell, she even tried to hook Tommy up with a completely different girl, after Kim had dumped Tommy. And it was Tommy who finally pursued Kat.
Evil Is Cool: Lord Zedd set the standard of coolness for Power Rangers villains. Even after he suffered Badass Decay because Moral Guardians thought he was too scary, he still managed some great badassery.
Masked Rider. All the times Super Sentai and Kamen Rider started teaming up since Shinkenger met Kamen Rider Decade in 2009... Power Rangers did it first with the crossover with Masked Rider/Kamen Rider Black RX in 1995.
Lord Zedd once sarcastically asked, "What is it this time, Finster? A monster that blows itself up?" At the time, simply a humorous jab at the show's Once per Episode fantasy conventions. Nowadays, people are more aware that "a monster that blows itself up" has a very realistic context. And even putting the real world out of it, Power Rangers Lost Galaxy takes the concept and plays it for serious drama when Trakeena turns her entire army of Stingwingers into suicide bombers in the finale.
It's either this or Too Soon, but in A Day in the LimelightChristmas Episode, "Alpha's Magical Christmas" (1993), enlisted by Zordon, Alpha invites the children (mostly without their parents' permission) to sing Christmas carols and set up the Command Center with Christmas decorations. This is getting a bit Harsher in Hindsight due to Michael Jackson's 1993 and 2003 Neverland Ranch "incidents", since he, like Alpha, invited children to his ranch for parties and fun times, mostly without their parents' permission, and the parents started to suspect that he could be a child molester, thereby backfiring the "Friend to All Children" trope in the latter.
There was a YTMND featuring Rita Repulsa as Hurricane Rita, one of the three most destructive storms in the 2005 Atlantic Hurricane Season.
Going back to Yost, there's the below-mentioned PSA, note where three children pretend to be Rangers, & gang up on a fourth child who they think took their ball where you shouldn't attack somebody because you think they're wrong.
The ending of the SNES Power Rangers game shows the five main characters haphazardly piled into a convertible cruising down the highway. Trini in particular is sitting up on the boot of the car. Trini's actress later died while driving without a seatbelt.
This PSA from the original series features a young Najee De-Tiege pretending to morph into the Blue Ranger. He would go on to play an actual Blue Power Ranger much later...
The crossovers between Super Sentai and Kamen Rider? Power Rangers did it first! As much as fans don't want to remember it, the Power Rangers met Masked Rider/Kamen Rider Black RX in 1995 while an actual crossover between the two franchises finally happened in 2009 with Shinkenger and Kamen Rider Decade.
In "Clean-Up Club", Bulk & Skull's video shows them practicing (miserably) with shinais. In Power Rangers Samurai, Bulk often uses shinais while teaching Skull's son Spike to be a samurai.
In "Calamity Kimberly", Tommy jabs that Bulk and Skull deserve their own show. Funny enough, there were originally plans for them to get their own spin-off series, during Power Rangers Turbo's run.
Tommy's Sentai counterparts are Burai from Zyuranger and Kou from Kibaranger. Completely separate characters, but amusingly enough, Kou's actor had previously played young Burai in a flashback.
In "Putty on the Brain", Bulk & Skull suspect that anyone could be a Power Ranger. The stare at each other, before shaking their heads. One of them was a red herring for the Gold Ranger.
Ho Yay: During the "Green With Evil" saga, Skull tries to kiss Kimberly. She ducks out of the way, leading Skull to kiss Bulk instead. Yes, the first kiss to ever happen on Power Rangers was between two males.
Tommy and Jason, who even had several "breakup" episodes; Rocky and Adam, who were best friends; Kim and Aisha, who were also best friends, briefly lived together, and there's a cute scene where Kim kisses Aisha on the cheek to cheer her up after a local sorority-ish thing rejects her.
Plus Jason and Zack before and after Tommy shows up.
Rocky/Adam to a much lesser extent.
Bulk and Skull. Not as much as some of the Rangers had with each other, but it was there)
LGBT Fanbase: Jason. He hangs around a gym, tends toward fanservice as much as any other male ranger, is always hanging around Tommy...The false gay porn rumors only made it worse. Also, Zedd for that metal codpiece.
Macekre: Par for the course for the franchise, but Season 3 is a notable case. The entire Kakuranger series was reversed; the Shogun Zords actually came first in Japan, followed by the Ninja Zords. (To say nothing of the Battle Borgs and Alien Rangers.) For example, Vampirus was the first Season 3 MOTW. The Japanese equivalent was in episode 36.
Magnificent Bastard: Lord Zedd, one of the few villains of the franchise to win against the Rangers multiple times.
Marty Stu: By Zeo, everything was about Tommy. Kimberly also suffered Chickification as soon as Tommy joined the team.
Nightmare Fuel: Lord Zedd freaked kids out when he first appeared in 1994... and considering that he was a skinless, brain-exposed, deep-voiced megalomaniac who kicked Rita out of the series in five minutes, it's no surprise why.
One True Threesome: Rocky/Aisha/Adam. Also there are hints of Kim/Trini/any of the male rangers, Jason/Kim/Tommy, and Kim/Tommy/Kat?
Overshadowed by Awesome: Even though they've never actually been onscreen together, this is pretty much the case with Zack and Adam. Each ranger of the original six is considered to be the best of their respective color, except Zack. And guess who's the one ranger that beats him to the #1 spot, Adam. Due to the overwhelming popularity of Johnny Young Bosch and his subequent returns to the series, Adam is the only replacement ranger to be more popular than his predecessor.
Ironic, considering that Adam has no personality (at least early on), while Zack, while stereotypical, at least had plenty of it.
Let's be honest, everyone succumbed to this thanks to Tommy, not so much during his Green Ranger days but after he became the White Ranger and the leader, everyone else was pretty much invisible.
And of course, few fans of MMPR would have realized, to begin with, that it was based on a Japanese franchise which had already been running for over a decade before Zyuranger.
Fans of Voltron will try and invoke this trope with respect to MMPR's use of Combining Mecha, which Voltron (1985) used first. Whilst Zyuranger's (1992-3) mecha design was meant as a tribute to Go Lion (1980), the actual trope goes back to Getter Robo in 1974.
Rooting for the Empire: Sure, they may have been cheesy and ridiculous-looking, (when they weren't hideous), but you just can't help but root for Bulk & Skull (at the very least antagonists during the first two seasons). The main villains got this as well, as they were at the very least more interesting than the flat goody-good Rangers.
The Scrappy: All of the Aquitan Rangers. Kat for Tommy/Kim shippers. Rocky for some (Especially Jason fanboys). Adam and Aisha fare better.
Special Effect Failure: For some reason still unknown to this day, Saban apparently couldn't get their hands on the actual Zyuranger Dragon Armor and tried to make their own. The problem is, Saban's piece is made of of shiny gold fabric, which looks completely different from the matte gold FRP original.
They Changed It, Now It Sucks: Lord Zedd was very scary when first introduced in Season 2. Too scary. So the executives demanded he be toned down to being a silly loser in Season 3, ruining the point of how dangerous the Rangers' job is. He did recover a lot of his original qualities mid-way through the season in the three-part "Changing of the Zords"
Also, Lord Zedd's Dark Rangers could have been a precursor to the Psycho Rangers.
Uncanny Valley: Some of the Megazord fights can be unsettling to watch, thanks to the camera angles and jerky motions from the suit actors.
Big Lipped Alligator Moment: "Green With Evil" parts 3 and 5 are briefly interrupted by "Dance-offs"; the first between Billy and Zack and again between Zack and Alpha. (Some episodes of the first season had a little less than nineteen minutes of runtime, they had twenty-one minutes to use.)