Once you spin a pokestop you can press the cross and all items will end up in your bag anyway (i.e. you don't actually have to click on them individually, or even wait until they all pop up).
Each 10th pokestop gives you bonus items.
Renaming Eevee into Rainer / Sparky / Pyro to get the desired eevolution only works once. (Reliably anyway).
If you're hunting with a friend, you will both see the same pokemon. However if you see a rare pokemon, only one of you will be able to catch it.