The Reality Subtext of her return. Valerie Vernon had left the show to undergo treatment for leukemia, and her return was heralded by the announcement that she was in remission.
In an earlier flashback, the Magna Defender reveals that Scorpius (the current Big Bad) killed the Defender's son Zika. To destroy Scorpius, the Magna Defender causes a huge firepit to explode, threatening an entire space colony in the process. Realizing what he's done, the Magna Defender heads towards the firepit to neutralize the energy and save the space colony, and there's a scene where he's crawling through a hellish firepit to reach his goal, his armour damaged and cracked, his cape in tatters - when the scene shifts, and the Magna Defender is calmly walking through a field alongside Zika, who is holding a bundle of flowers. Zika tells his father that he's proud of him, and he gives his father the flowers, and the Magna Defender responds by saying that he was proud of Zika, too. The scene shifts back to the Magna Defender crawling towards the firepit - and he's still holding the flowers that his son just gave him. It's the most beautiful, heart-breaking moment. The only time in 17 years where Power Rangers actually made me cry.
According to the Power Rangers Wikia, Kendrix was kept in the credits as a main star so Saban could keep paying Valerie Vernon to help her treatments. D'aww...
Something of a retroactive one. The Karone we see in this series is bubbly, cheerful, playful, and kindhearted. At first you might be tempted to write this off as inconsistent characterization, considering she wasn't really like that in PRiS, even after her Heel-Face Turn. But when you think about it, it's because she was raised/brainwashed to act differently, and at the time of her lastappearance she still wasn't quite comfortable her own skin. In other words, she was like that on the inside the whole time. And it's probably why Zhane was attracted to her, even if he didn't consciously know that deep down she wasn't evil.
On that note, the ending of Karone's introductory episode has a great moment where Karone talks about her being Kendrix's replacement. She's obviously feeling the weight of taking up a fallen ranger's sword, but the whole team turns out to express their faith in her to carry on in Kendrix's place.