I've come across most of these issues too. The most annoying one (apart from teaching toddlers) is, in my opinion, that sims you sim know don't show up when creating a club and adding members. I have a sims that is working on the Friend of the World aspirations, he has 20 friends (full green bar) but for most of them he has to go around finding them asking them to join the club, I can't just select them because they don't show up. And no, I don't have any club rules active.
Same for family members, I can't add them myself so I have to have one sim in the household go around inviting the others into the club or have them check in the club panel and apply to then get in.