There are some big proposed changes to how local bond measures work, rent control, and the criminal justice system, IMO those are the ones spending the most time researching and considering the consequences.
As far as the more niche ones this time around, there's the same-sex marriage prop (which I believe is purely symbolic and doesn't have an actual impact on same sex marriage in California) and the prop designed to force the AIDs Healthcare Foundation to spend more money on AIDS healthcare (IIUC currently they spend most of their money on political causes like lobbying against rezoning that would allow denser housing)