Super Ninja Steel was the last Power Rangers season to have its toys made by Bandai of America, and also the last season to be produced by Saban after they bought the franchise back. Starting with the season that succeeds it, Hasbro becomes the toy producer, and also produced the franchise (although Saban will still serve as creative consultant).
Jordi Webber is a singer in real-life and his character, Levi, gets to perform a few times.
Dawson Casting: As usual for the series, but fans gave special notice to Chris Reid as Victor. With lines like "he looks old enough to have a kid in high school, much less be in it" (a bit exaggerated of course, but still).
Executive Meddling: The Ninja Battle Morpher exists because Bandai asked Saban to change it from the sword used in Ninninger, knowing that the swords would sell well due to being the ranger's main weapons; including a separate morpher would increase toy sales.
Judd Lynn revealed at Power Morphicon 2018 that it was due to this trope that the comedy that's present in both this series and Dino Charge is here, and his team wanted a tone that was more akin to In Space.
Zoe Robins, Jordi Webber, and Mike Edwards are New Zealanders playing Americans.
Furthermore, Will Shewfelt (of Desi descent) and Jordi Webber (Maori New Zealander) are both playing Latino Americans.
Fan Nickname: After the first episode, Bomb Pop for the trio of Brody, Sarah, and Preston since their colors match up to the ice cream treat of the same name.
I Knew It!: Many fans were right when Levi was revealed to be Brody's long lost brother Aiden.
A lot of people accurately guessed that "Aiden" from the end of Poisonous Plots was a robot/spy by Madame Odius.
Also, many assumed Brody's dad wasn't as dead as we were told to believe. The finale of Ninja Steel confirmed that he wasn't dead at all.
Irony: Super Ninja Steel marks the first time that Power Rangers crosses over with a character (Sheriff Skyfire, AKA Sekai Ninja Sen Jiraiya) derived from Metal Heroes, yet the twotimes Saban actually adapted Metal Heroes series, there was no crossover with Power Rangers (not counting the crossover between Turbo and Beetleborgs Metallix in the comics).
Many fans theorized that Brody's brother Aiden would be revealed as the Gold Ranger. Episode 8 supposedly proved them wrong, introducing newcomer Levi Weston as the Gold Ranger. Ultimately subverted when it was revealed that Levi Weston was actually a stage name for Aiden.
Others theorized that Aiden would be the third Red ranger like in Ninninger and Dane Romero would reprise his role as the Red Ranger. While the real Aiden turned out to have the Gold Ranger powers, Dane Romero does come back in the finale, but the third red ranger is someone no one expected: Mick.
Mostly played straight with Cosmo Royale, who appears to use the suit of Baron Nero from ToQGer (a villain, of course, not used in Ninninger, similar to Furio from Lost Galaxy), but with the head changed for one more cartoonishly monstrous.
The Super Ninja Steel Halloween episode had a group of seven monsters, three of which were not from Ninninger. One was Vancuria from Magiranger/Necrolai from Mystic Force (not the first time she's been recycled as she showed up in Dino Charge), another was Sanyo from Gekiranger/Snapper from Jungle Fury, and the last was Debo Kantokku from Kyoryuger, who was never used in Dino Charge.
Recycled Soundtrack: As part of the 25th Anniversary, Super Ninja Steel used background music from MMPR, including the Bulk & Skull theme for Victor & Monty.
Real-Life Relative: Peter Sudarso plays Preston the Blue Ranger. His brother, Yoshi Sudarso, played Koda the Blue Ranger in the previous series, Power Rangers Dino Charge. Slightly off-topic, but Yoshi Sudarso guest starred in the 34th episode of Ninninger as a tourist, briefly interacting with Aoninger before evacuating: the very Blue Ranger whom Peter Sudarso ended up portraying in Ninja Steel.
Much like its Japanese parent show, most of the auxiliary Zords have poor articulation due to their transformation schemes (including Robo Rider, which has little excuse). As a result, the Robo Red, Dragon, and Rumble Tusk Zords got standard 5 inch figures made as part of the Morph Armor subline and can either sit in the command seat of the Megazord or stand in as better articulated stand-alone toys.
The Ninja Blaster toy was given a near-complete overhaul compared to the Ninninger version; the new toy has similarities in its basic design scheme but is very different in the detailsnote The American version has a more angular "cool" aesthetic with angry eyes, the mouth doesn't open, and it shoots Power Stars instead of having a tongue-shaped barrel.. Yet, the show itself and even the toy's packaging continues to use the Ninninger props, giving us a rare case where a Power Rangers toy is made that is blatantly not show-accurate.
The Ninja Star Blade is similarly... similar in a broad sense while being different in the finer details. The layout of the buttons on the blade are much closer together, the haft is much shorter, and it has an spring-loaded blade gimmick that gives it a narrower tip that extends when a button is pushed.
Comparatively, all of the Gold Ranger props are extremely similar between show and toy, with only minor differences between the Morpher and its toy counterpart. This is necessary due to the show using the Ninninger props for Power Stars while the toy uses the smaller foam ones common to the line.
Teasing Creator: Peter Sudarso had a lot of fun dropping little hints in the months before the season started: visiting a restaurant run by Kelson Henderson long before it was revealed that he would be returning to an on-screen role and posting a picture of himself with a third eye to slyly reference his character's last name being Tien. This has led some fans to comb through his pictures from that time frame and speculating which ones are also hints and which ones are simply for fun.
Unfinished Episode: An episode was written that would have Calvin and Hayley break up, Calvin would then start dating Sarah. Zoe Robins and Chrysti Ane talked to Chip Lynn about this, saying they didn't want to teach kids it was okay to steal your best friends significant other (not to mention the Unfortunate Implications of a white male dumping a black female for a white female), and the idea was partially scrapped. Calvin and Hayley do break up at the end of the first half of the season finale but get back together in the second half.
Kelson Henderson returns to the franchise in his first Saban-era onscreen role as Brody's shapeshifter friend Mick. He was previously Boom in SPD, Phineas in Mystic Force, Norg in Operation Overdrive, Flit in Jungle Fury, and a handful of smaller roles (mostly voicing Monsters of the Week).
Josephine Davison who played Morgana in SPD and voiced Itassis in Mystic Force showed up in one episode as one of Sarah's teachers when she signs up for many clubs.
Daniel Sing, who played the past teenage version of Sensei Kanoi Watanabe and his twin brother Kiya, the present day Lothor from Ninja Storm, is the Mayor of Summer Cove, hence once more being part of a ninja-themed Ranger series.