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The ending of this film always gets me, the bit with Ryotaro's parents and then seeing Ryutaros's crayon drawing in place of the lost photo. It's a nice, sweet, simple moment.

The rest of the movie? It's also really good. Like you said, it's very much Den-O but with a bigger budget and the ability to use it to indulge in even more chaos. The story doesn't even feel all that consequential; Gaoh himself was pretty tough, but the legendary time-destroying ancient Aztec train goes out with minimal effort. There's a lot of running about and some good emotional stuff, but otherwise it really does feel like another strong Den-O story.

So guest star corner:

You noticed Todoroki and Tadokoro. I'd honestly forgotten they were in this one. There are two I want to highlight, though.

Gaoh is played by Hiroyuki Watanabe who, in addition to being very handsome, is a fairly prominent tokusatsu veteran. in the late 90s he played the commander of XIG, the anti-kaiju defense force on Ultraman Gaia. More recent to this movie, he also appeared on Garo as Taiga Saejima, the main character's father and predecessor in the title role.

More relevant to your interests, Kotaro (young Ryotaro; not to be confused with Kamen Rider Black, Kamen Rider New Den-O, or the milk guy from Blade) was played by Takuya Mizoguchi. Mizoguchi would go on to return in Kamen Rider Ghost as Shibuya, one of the two assistant monks whose names I can never remember. Shibuya is the one with glasses and the awful mom who gets turned back into a kid at one point.