Just did some testing with Nami and found two items.
#1 - If you try and self+smart cast her W it doesn't work. The expectation would be that it would target you first, heal, and then bounce to enemy. I know that it's a choice between targets, but the self+smart should override that, as long as the spells sees "self" as a valid target
#2 - Nami's E does it's bonus magic damage to structures. Not sure if this was intended, as bonus magic is weird on a case by case basis.. I watched the health of the turret drop quicker when it was used.. if you watch the popup colors saying how much damage was being done though, it didnt appear to match the actual bonus dmg.. in other words, the bonus dmg came off the health, but didn't show in a popup color.