The maps are so complex, and so few people have completed them, IMO, that it would be better to write directly to those who have played them.
This has already been done. From Bug-Race, as far as I remember, there are three issues: a campfire that allows you to complete the map much earlier by generating mercury, an incorrect placement of the hut, which makes it impossible to enter, and a blocked cell for landing a ship after freeing the hero from prison (this cell can be "unblocked" by using the repeat turn option, but it shouldn't be that way, as it can only be done with the HD mod; it doesn't work in the clean SoD version; the map was originally tested on the clean SoD version).
In 3 hoch Smash, there is a problem with the underground gates in some version of the map. Descriptions of walkthroughs for these maps are already available in this thread from Marlo, and there is also a video walkthrough for Bug-Race, in case anyone missed it. I am basing my information on them; if there is anything to add, feel free to do so.