I think aazed said that part of the ZED agreement includes 2 checked bags. I know that UA allows NRSA 2 bags, and they don't specify OAL stuff at all.

That said, I've flown a lot of UA flights lately, and can boil it down to this:
Gate agents usually give economy plus to nonrevs (I can only think of a few times where I did not get that). When I went through Skywest training, nonrev karma was taught when we were told how to clear standbys.
Mainline flights often have headphones in the seatback pocket, but don't count on it.
Wifi is only available (I think for a fee) on the Premium Service routes between LAX or SFO to/from JFK
Soft drinks are free in all seats (I think US Airways is the only airline that tried to charge for it, but they backed down when nobody else went along with that)
All mainline flights have shared video, but not too many Y seats have personal screens (I think the international 777s might, haven't been on one yet... you can always check seatguru for that stuff)
I had the tapas snack pack on a mainline UA flight, and it honestly wasn't half-bad! Lots of little things, good for a decent cold dinner.
No biscoff cookies (or any other free snacks)