There's three things you have to watch out for that come from having patch 1.42 but not Seasons: a) if you have people get married, you'll have to work around the "move in" screen not automatically popping up and the name not getting changed, b) apparently analyzing space rocks doesn't work, and c) the telescope won't work properly, so you won't be able to use Logic as a supermax if you haven't already completed the telescope challenge.