6:58 Toei's magic words (変身!). Ginrai still watches Kamen Rider these days or grown up watching Kamen Rider and believes he's one of Kamen Rider heroes??
He's not Optimus Prime in this series. Ginrai is just using the new body that was created for Optimus after his first death in the film. The toy was known as both Powermaster Optimus Prime and Godmaster Super Ginrai.
The difference is that Ginrai joins the Autobots a couple of episodes later and is a full time member. Later, he becomes the leader when Godbomber is almost completed.
4:25 Cel sheet scenes recycled from More than Meets the Eye episodes I think. Exactly the same cliff where Hounds and Cliffjumper were scouting for Decepticons.
Since hasbro stopped airing transformers in North America, takara got to return transformers to its diaclone roots with humans piloting robots. Yeah, it was bad.
The Pretenders are sentient, the human forms are judt a disguise (the original toys had the larger human figure as a kind of shell which hid the smaller robot). In Headmasters it was explained why the Headmasters and Godmasters (or Powermasters in the Marvel comic) had the vehicle mode as an exo-suit because originally they wete developed by Cybertronian "civilians" who were training to survive in the harsh conditions of a planet named Master.