The intergalactic game show premise of Ninja Steel may be out-of-the-blue, until one realizes that Power Rangers (2017) is co-produced by Saban and Lionsgate. Lionsgate handled the movie adaptations of The Hunger Games, so someone at Saban got the idea. Not to mention, Peter Sudarso actually won a very similar type of game show (on season 7 of Wipeout), so it also serves as a nice Actor Allusion.
The fact there is an intergalactic game show. This could easily allow for the Alien Rangers to appear if they want to include the Kakuranger crossover.
Sarah's hoverboard may be a little odd by today's standards, but remember that in the Power Rangers' world, a space colony was created in the early 2000s (although granted, it was by reverse engineering an existing space fortress of alien origin). In this universe, technology is showing to be decades ahead of our time.
One could apply this to Monty's machines like his robo arm for Victor. Hell, Redbot being a legit automaton was accepted in his book signing.
In episode 34 of Ninninger, Yoshi Sudarso makes a cameo early in the episode. In that episode, he's rescued by the Ao Ninger (aka the Blue Ninninger). Guess who's playing the Blue Ninja Steel Ranger? Yoshi's brother, Peter. Actor Allusion at its very best.
Though closer to Fridge Sadness, Brody believing that Aiden would still be at their old home and his denial that he's missing seems a bit odd for someone Brody's age but there's a few good reasons for his reaction: Brody could be emotionally stunted from his years as a prisoner and doesn't have the maturity to process this or he has hyped himself up for this moment for so long that when it didn't happen like he was expecting he was crushed.
Brody using his datacom to get answers on a test makes a lot of sense when you remember he spent ten years in space and likely didn't know that it's considered cheating. Furthermore, being raised in a harsh environment was more likely to encourage him to do it.
Galvanax being willing to use giant holograms of himself when he doesn't want to be seen as weak. Well, if he defeats the rangers that way, he'll still be seen as having overwhelming power. If he loses, he can blame the failure on his monster. It gives him all the benefits without any real drawbacks.
Episode 5 revealing his fear of driving explains why Calvin rides on top of the Nitro Zord instead of going into its cockpit to drive inside.
Considering it's been a relatively short time since the premiere, Levi's "disappearance" not being mentioned can be accounted by him being in isolation to write a song and likely requested his manager to leave him be. Odious also could've likely answered his calls with an impersonation of sorts just in case, alien tech and all.
Despite the lack of Starninger's morpher, Levi's got quite the fondness for burgers, and it ultimately does show up as his camera because of this, as explained in-universe.
Turning StarNinger into a country singer may fit the motif, but it does raise the question of how they're planning to market this to the show's target demographic, which doesn't quite align with it. Then we hear one of Levi's performances - and it's a Suspiciously Similar Song to "Story of my Life" in country style. Furthermore, Country is currently second only to pop on the radio. It's not really a hard sell, especially after Disney made a series about a country/pop singer.
In episode 17, how did Haley get a hot air balloon for her campaign? Easy. She got Preston on her team, so he could've borrowed from his dad for the campaign.
The rangers don't seem too combine megazords too often after Levi joined the team. This could be chalked up to the Sentai footage, but it makes sense within the theme of the show, which is ninjas. Ninjas rely in numbers, speed, and agility. It's better to use 2 basic megazords that have superior speed and agility over one giant combination that's too bulky to do anything. The only times they did it are to destroy opponents that can overwhelm 2 basic megazords.
The Blue Ranger's roll call is "stealth of the ninja". Of course it is. A common misconception is that ninjas wear black, which was only popularized by kabuki theatre (stagehands wear black outfits and are ignored by the audience, which means the best way to have a stealthy character - like, say, a ninja - seemingly appear out of nowhere is for one to yank his breakaway stagehand outfit aside and leap into action. Hence the standard ninja outfit, and probably the Flung Clothing changing method.) and western media. In a typical night stealth mission, ninjas wear blue to blend in with the (then) night sky, which is not completely black, but dark blue.
The Lion Fire stars being the first to return with the Prism's revival makes sense to a degree since the armor and spacecraft belong to Viera seperately, both being summoned from the Lion Galaxy itself.
In episode 3 of the super season, part of the spell that turns Levi evil is "ninpo kinji". This is an obvious shout-out to Ninninger, but it also works in a meta sense. The phrase "Ninpo: [something]" is used to announce a technique or spell. Thus, "Ninpo: Kinji" means "Ninja Technique: Kinji", and Kinji in Ninninger was antagonistic at first to the rangers. So, when Levi speaks out loud "ninpo kinji", he becomes like Kinji.
Why did the second and third Ninja Steel Red Rangers have different color sashes from the original? Because remember, the Morphing Grid can only support one of a specific power at any one time, so changing the sash makes it more akin to the Quantium Ranger and the Time Force Red Ranger than two of the same power existing at the same time.
Sarah's mom and Hayley's dad getting together may be more than just plot-contrived - Sarah's actress is South American, which is especially evident when you see her Caucasian mother, while Hayley could pass for half-black. This wasn't their first Interracial Relationship!
Of all the Dino Charge rangers who could've returned for the anniversary special, why only Koda? It's because he has the least amount of personal obligations outside his ranger duty. The others have either school, work, or other personal obligations. Koda is just a caveman living a simple life in a simpler time, so he'd have the most free time.
While not apart of Time Force itself, Wes still has access to Time Force equipment shown in Reinforcements from the Future to communicate with his future friends and would be authorized by someone like Alex to go through time and other dimensions if anything like a large distortion in dimensions were to occur and the future rangers could not be dispatched.
How does Tommy have a "Master Morpher" that allows him to use a MMPR-styled morpher to morph into his various Ranger forms, even though several of them have been lost for years? Operation Overdrive had already shown the ability to restore connections to the Morphing Grid, and the Megaforce Rangers used a single morpher to access the powers of every Ranger that preceded them.
While it was stated that any ranger would trust Tommy, three of the kidnapped rangers are former teammates of his and one is the person he passed his Turbo powers onto.
If you consider that black and green are often interchangeable between seasons, the kidnapped/cloned rangers represent all the colors of Mighty Morphing through Zeo season. Tommy-Black/Green(only his Black Dino Thunder powers were cloned, Rocky-Red, Kat-Pink, TJ-Blue, Gia-Yellow, Trent-White, and Antonio-Gold(possibly also the Sixth Ranger concept, but Trent is also a "sixth").
Why does Galaxy Warriors in Super Ninja Steel not react or even mention Galvanax's death and allow Madame Odius to take over without hesitation despite her betrayal of him being a part of his death? Remember when Odius warned him that his fans despise weakness and that the Rangers knocking him down would make him look weak. Somehow that reason to not fight the Rangers for most of the series turned out to be valid after all. Also explains why the audience in the Poisy Show also had no problem with the show replacing Galaxy Warriors when Odius was killed too.
In The Poisy Show, Preston ends up in prehistoric times, and meets both Koda and a couple of dinosaurs. Normally one of these would be out of place, but it makes sense... because this is the altered version of the Dino Charge world, where Sledge died in prehistoric times and the dinosaurs never went extinct.
The greater implications of the manner of Sledges return are pretty staggering. If the black hole from End of Extinction was really a dimensional portal, we have to ask... is the Earth were watching now the one that got sucked into the portal back then, or is that Earth floating around somewhere in this universe? And if so, which one did the other seasons take place on? And if the Earth that experienced most of PRDC is in the Ninja Steel dimension now, does that mean the Dino Charge team simply vanished as far as this world is concerned? To anyone here, including their friends and families, the Dino Charge team never came through the portal and were just... gone. It also means being in another dimension insulates you from alterations to history. Of course, as an anniversary season, theres every chance some of these questions will provide fodder for later episodes.