As for things on the registry that are useless in my opinion —
wipe warmers, bouncy seats (mine used a swing, but I don't think I ever needed both), Bumbo seats (# 2
popped himself right out, thankfully he was on the floor in an open area), baby powder (I have no idea why that is still on registry lists), those formula dispensers with three sections (mine always seemed to «leak» from one section to another).