At the moment, I see two issues in my current game that may or may not make problems.
1) Before my household split and moved, they had some butler. About half of the family moved up on the hill in SV (this remained the active family), and afterwards the other half moved to the other end of town. I actually deleted the original house that was full of stuff in the next step and placed another house back from the library. I noticed that the old butler still lives there. He's not a resident, doesn't own the house (the house counts as empty), but he is sitting in there, using the pools, etc., or in other words, he's not disabled like other inactive service people. Can I just annihilate him, or does that cause issues? There's too many service people in my town anyway.
2) Up on the hill in SV, both neighbors on both sides (Landgraab and Alto) produce constant error messages about being unroutable. When I look, they are actually in the original parking position near the entrances. Is this due to those houses being close enough to be in some kind of half-rendered state? Can I do anything about that?