Carranger marks a major staff change-over point. The producer behind the Zyu line of shows leaves Super Sentai at that point and goes to work for Capcom, producing a lot of the company's more surreal 90s output.
That was just the main writer of the Zyu through Oh run, Noboru Sugimura. Producers and directors mostly stayed the same. Longtime Sentai producer Takeyuki Suzuki, who had been on since Goggle V,
did leave after Ohranger (and a sub-producer of Ohranger, Shigenori Takatera, took over for the Car through Ginga run), but Suzuki stayed with Toei, setting his sights on a higher position.
Not to speak ill of the dead, but...Sugimura's not one of my favorite tokusatsu writers. I think Dairanger and Kakuranger turned out good, but Sugimura relied far too much on just trippy, weird-ass, WTFness. I think Zyuranger and Ohranger go most nuts with the weirdness, but it definitely crept its way into Dai and Kaku. I remember when I first saw Dairanger, some of that Gorma stuff, and thought, "Geez, how many drugs is this writer on?" My
theory is...Twin Peaks was popular at the time, and I know the Japanese loved Twin Peaks, so I'm thinking Sugimura must have been a fan, and was trying his hand at Lynchian weirdness, which resulted in some circus-freak Sentai shows.
Sugimura was also on some kick about incorporating more kids into the shows, which is something I think makes his shows suffer. Kid guest stars hogged the spotlight in Zyuranger and Ohranger, often making the heroes feel like a non-presence -- like guest stars in their own shows! (And it's why Toei graciously bestowed Kiba and King Ranger upon us.) But I think that's why Dairanger and Kakuranger turned out the best of his shows -- they still focused on the heroes, whereas they were barely there in Zyu and Oh. I actually think Kakuranger is the best of Sugimura's shows because the kookiness just fit that world so much better than it did in something like Dairanger, it was more consistent.
Sugimura also wrote Kamen Rider ZO, the movie about Kamen Rider chasing after a kid for the entire movie's length, and where the main villain is a kid.