First one:
Mission Mansion (small one), :Important person lives here:, last alien sin't physically on map, or should I say - it's not even in map, but game say's, it is. Leaving territory by abandon, system said there was last alien survivor (who killed all civilians, as I leave territory). Don't have save now.
Second one:
Such missions, as above, have strange bug. If save before enter it in geoscape, loading this save makes it disappear in pause mode. As I start time, it appear again. Same one.
Third one:
In base defense maps, defense structures, such as missile battery and laser defense, on surface has wrongly placed antennas in mirror side. I mean, they were 180degrees turn upside down.
Fourth one:
Can't say for sure, but research log on object: Alien targeting (or somehow like that. Alien computer, for sure), in preview window had inverted faces, so, object textures were from inside. As well they were too big, for minimal zoom in window to fit.
Sry, can't find any screenshots I made. Thought, they weren't screened at all, as I guess now.
Save games won't change much, so, I'll give everything what asked, if need. As well I'll answer questions too.