Some additional notes because I inevitably disagree with some of my own points here.
-I do like Toru Fuyuki's score, his work is all iconic, it's just that one particular pinch music track that gets old.
-5:12 "It took until Tiga for an attack team I thought was as good as the original."  I've been revisiting Ultraman Towards the Future, which came out before Tiga, and that one has a pretty decently rounded attack team so I would walk back that statement a little.
-6:34 "Ace is infamous for his monster mutiliations, even if he doesn't do it all that much"  Is a statement I've been thinking about for the past week.  I've gotta look at a compilation or something and count all the times he does it, it feels like people either exaggerate how much slicing and dicing he does or he really does do it a lot.

Fun fact: This is one of the few Ultraman shows that was used as stock footage in the infamous Korean monster film War of the God Monsters.

I can't believe you didn't mention the episode with the actual serial killer in it. One of the most memorable eps in the entire showa era for me.

Minami was removed from the show because of the audience disliking the idea of a Female protagonist, so, to try to fix that, they just removed her from the show and made Hokuto transform by himself.
At least Minami got to return in Taro and Mebius (with Mebius being apparently her lastest appearance)

The Yapool themselves get retconned pretty often. The main series makes it clear that the Yapool are a race with a gestalt form, given that multiple Yapool are running their own plans from every episode until episode 23 where they combine into Giant Yapool, and the surviving Yapool make their return later on with homicide on the mind. They were retconned into a single alien right until Z premiered, and to be honest the return of the Yapool-men is kind of a breath of fresh air after Giant Yapool gets his ass handed to him every appearance.

The loss of Minami and the departure of the Yapool as primary antagonists really hurt the show, I think. The Yapool episodes were kind of dark with emphasis on horror (Cowra and Brocken possessing humans, Vakishim's backstory with the implication that the Yapool had the kid's parents assassinated, Garan in general, Aprasar, Black Pigeon, Hotarunga, Ace Killer being a literal Frankenstein, and Baraba and Aribunta casually murdering people in broad daylight, Episodes 22-24). Ace went from dealing with a malevolent alien Illuminati to dealing with typical adventure-of-the-day episodes.

I always heard that Japanese mothers complained about the violence and Yuko and that's why things were either toned down or removed, and the only reason I believed it to an extent was because of those episodes later on that paint Japanese mothers as the villain, like the violin episode or the hot air balloon one. Those seemed really spiteful. I also thought Space Mask was always a pretty clear Kamen Rider parody and the harsh death you pointed out just kinda solidifies that with me, although I never see anyone bring it up. Still, I like this video a lot an I'm glad you made it.

Ace is my intro to the Ultras.. my OG Ultra for me..

Ace is a rock solid Showa Ultra show for me, utilizing the weirdly abrupt pacing of RoU’s back half to its advantage while introducing (and proudly waving) the franchise’s freak flag.

Honestly, ep. 41 (the tapir one) is one of the best Jissoji episodes not directed by Akio Jissoji and that final episode speech is basically the Ultraman franchise’s core message in a single paragraph.

I feel like the terrible-monster designs started out with the idea that they were cyborgs of sorts. With weapons like missles and guns hidden in their bodies. Then they just devolved into having a flamethrower.

I only have fond memories of this because the bird vomiting acid on ace was like the coolest effect I've seen from the Ultras when I was a kid and also the grunts he does are the coolest out of any Ultraman.

I wa as so happy Barabas got a new suit and returned in Z. He seemed cool than Ace Killer.

So, I only found this out, possibly as some retcon from Ultraman Z, or non-conveyed message the show said ONE time, but Ace's moves all focus on brutally slicing his opponents apart due to the Terror Monsters "Not feeling any pain and not being true living things". This is why Doragory tears Maruchi to pieces and laughs about it and why when Ace gets any of the monsters in the right spot, he brutally slices them to pieces. Again, this may just be an explanation given years later in Ultraman Z.

17:12 I can’t control my laugh

If I can say something positive the show teaches us the bounty of “Ice Cream on the Cob”: two soft serve cones smushed together like so

I feel like the show could have had more interesting plot lines if it stuck with the original 2 people transformation. What if one wants a vacation? What if one is mad at the other. It would have been pretty interesting

Don't rush it. History of Ultraman will be out when it's out and we like that. Great work ethics.

11:42 five night feddy

Oh right Ace is not just the guottine master but swinging knee master since he did that a lot. Geed is the flying knee master. This showed seemed to have a lot of fire spitting and the monster with the flame sword was cool if dangerous no doubt.

Ace is an alright show, but I definitely understand why some may not be fond of it

I haven't watched that series yet, but what I like about Ace himself is that his design and originally having multiple hosts reminds me a lot of Sym-Bionic Titan