The way I see it, most people wouldn't be able to improve another world directly. Oh, you know how X and Y work, yes, but to build them from the ground up sans any tools at all is something else entirely. Which means it's little things, like the characters wearing underwear and the astonishingly intricate seams of their clothing, that attract notice and the amazement of others. I'm also having fun lampshading worries, like eating the food on another world and worries over diseases you might get or bring with you. That said issues are taken care of via the gate between worlds doesn't stop the one character from getting worried about things like that.
Plot wise, the character that should be the most fun to write is showing up soon in the one timeline; I am not quite sure what is going to happen in the other though Jake being tried for war crimes is now complicated because he is travelling with a deserter from the army and said deserter's son.
Notes for me:
- Having brought up skin tone, it shouldn't come up again often. Jake had no reason to mention it as he has been in the Kingdom before and is aware that, as a Caucasian male, he isn't common in some parts of the Kingdom but it's hardly cause for wonder or alarm. (At least in the southern parts of the Kingdom.)
- The deliberate lack of female characters thus far - Seri excepted - will come to the forefront soon as the status of rights in this world (both noble and commoner, male and female) collide with the sensibilities of Jake and Thomas and the extent one should impose on other cultures or seek to change them.