So, it's been many years since I last watched the training filler, which will make this interesting.
Episode 127 - Popo's training continues to be portrayed well and show the fundamentals Goku would take to heart for the rest of the series. I forgot to say last time that it seems questionable how birds would be able to reach the Tenkai, but now a wasp as well? And Popo even brings in a cat out of nowhere? Has he just been using his carpet to fly around collecting animals?
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Toei's idea of a high-tech teleportation machine was interesting, considering Toriyama may or may not have shared with them any plans for Kami's origins. Of course, Kami needing some high-tech machine for transportation will get washed away with the reveal of the magic carpet in the Freeza Arc, but it's still a decent idea. The filler also presents the idea that some humans have innate harnessing of Ki without training, which does fit well with how advanced alien races seem to be so accustomed with Ki control as to use it without training. I do like the Journey to the West imagery with Goku wearing a crown he can't take off.
As for checking in on the Earthlings, Kuririn does a decent job against Ten in sparring. Guess the latter's injuries from the battle with Drum were still healing, until the next episode where they're fine
It's also good that, unlike in the Ten Long filler episode, Goku doesn't master the new skill by the end of the episode and is only able to gain an extra step towards his current goal.
Episode 128 - This episode does a good job in following on from the last episode in Goku coming closer to learning the basics of Popo's training in an unconventional way. It is interesting to note that when being told where to find Yaochun, it's said to be at an area 5 ri (a Japanese unit that makes this distance around 20km). This does a good job at making the setting feel more realistic than everyone all using the metric system, something that ought to definitely differ in a secluded, rural land.
Roshi makes a good point when insisting the 4 Earthlings go off on their own to train as Goku did as to not live in his shadow. From what we're shown throughout the series, they often gain more from the same types of training regime than he did. Perhaps if they were to do something such as receive Kami's training at the same time he did they might have remained on his level until Kaioken or Super Saiyan caused the gap to become too much. I'm not sure how to take the scene of Ten and Yamucha trying to listen to Roshi's advice of a ladies' man. It's funny, but goes against how Ten's portrayed later as being virtually asexual or at least pretty fervent on not being distracted by romance. It also comes off as pretty bad for Yamucha when it suggests the
lie idea Toriyama would later have of Yamucha apparently not being faithful despite his and Bulma's relationship seeming to be pretty functional at this point. I guess you could assume he was wanting to get tips for improving his relationship, but that's very wishful thinking.
Episode 129 - Yeah, the time travel episode...The Room of Time is pretty interesting when considering the manga would employ a similar concept in the Cell Arc, but it does raise a lot of questions. It it also allows you to go into the future as Popo stated, how is this not used by Kami to essentially tell the future for all possible outcomes? If the person is travelling into the future, is it a future that plays out under the assumption they were erased from the timeline at the moment they left? It's things like this that help show why you should never use time travel unless you have a detailed enough grasp on how it functions in a logical way for your story.
Then we have Mutaito being able to block strikes from Goku and knock him back with his Ki. The latter I'm fine with when the point is to have Goku further improve his skills rather than relying on power, but it's a stretch to believe he can put up a fight against someone stronger than a guy he was helpless against and who has become slightly stronger since his training on Mt. Gorogoro according to Popo. Looking at things retroactively and trying to make it fit, I'd just assume things like this and the filler in the Saiyan Arc that involved Saiyans from a century ago wearing the armour of the Freeza Force, I'd just chalk it up to the past/future in this room being closer to a tailor-made simulation rather than an authentic version of events, especially considering Tsuru was able to bruise Galu somewhat.
The episode also suggests the Kame Sennin and Tsuru Sennins real names are just Kame and Tsuru. To be honest, I do prefer the dub having their names be Roshi and Shen. Another thing I prefer from the dub for this episode is the voice acting for their young selves as their regular seiyuu really have a hard time selling the voices they're using as ones you could imagine two 18 year olds having. There's also Fanfan, of who I struggle to say is either lazy design or a nice touch. She looks like Colonel Violet and has a name similar to Ranfan/Lang Fang's with the same seiyuu as her. Either this is just putting two characters together and calling it a new one, or a way to hint at this being a common ancestor of both.
As for what I found good in the episode, the lessons Goku learnt on Ki control were pretty good and gave a somewhat decent explanation on what it is, whereas the manga would take up until the Boo Arc to explain it in layman's terms to those who aren't too familiar with the concept's roots in eastern martial arts. Also, I burst out laughing when Tsuru made a low-key reference to the Bright Slap when Goku punched him. If only it was Ten doing so to Yamucha to add to the authenticity, given their seiyuus
2 I've also got to laugh at how Tsuru's motivations for his evil deeds in the episode basically just make him an incel
Still, even with how good its set-up for later Ki control was, the episode had so many nonsensical things about it that it was definitely the worst one yet, or at least on the same level as the aftermath of the Pirate Cave events.