Funding setup costs: even if you're not buying land, moving into a house for rent can be quite expensive. There's the safety deposit, furniture costs, appliances, and so on. RGB "came up with a system where one person loaned the money and got paid back over 2 years via house dues" which I thought was an interesting way to split the costs evenly but still more manageable.
Non-resident community: they talked about how their community involves non-residents as well. I think it's fun from a "yay lots of friends and new connections" perspective, and it's also very handy for recruiting known and liked people to come live at the house! RGB talked about how they have events corun by a resident and non-resident, which I think is a great idea.
Guest room: "There’s a dedicated guest room. You book it on a shared Google Calendar. Guests can leave a donation if they want, but are not charged. Pink sheets are guest sheets." -- I talked to someone recently who really advocated for guest rooms. It's a way to connect to the wider community, it brings new energy into the house regularly, and also most SF homes don't have a guest room so it's really handy for friends who are travelling through.
Disbanding: I was amused by a mention of "disbanding the community if it gets mean or boring" -- I appreciate that they added boring ha! There are lots of reasons a house might disband, and it seems useful to talk about them up front. Another reason is if there's barely anyone putting work into maintaining the house and those people feel like that work is unsustainable.
Paying for empty rooms: At RGB, "All housemates bear the cost of the first vacant room as a group. Master tenants eat the cost on the second and beyond." I've seen several houses do this in different ways. This one works nicely in that everyone is incentivized to fill every room, but not everyone has to run the risk of rent getting unreasonably high for them (which would force even more move-outs). Some community homes have special landlords who let rent be unpaid while the community is actively looking for good residents (since these landlords are invested in the health of the community overall). I've also seen systems where they collect enough surplus rent when rooms are filled to be able to make it through periods when rooms aren't filled. This feels like something important to think about and write down a policy for before it becomes relevant.