Doug Sundseth said:
"Your own nonmagical club or quarterstaff becomes a weapon with a +1 enhancement bonus on attack and damage rolls."
The description doesn't say it becomes anything other than "One touched nonmagical oak club or quarterstaff". (While that's an arguable inference, I don't know that it will stand before full-blown pedantry.)
"Damage reduction may be overcome by special materials, by magic weapons (any weapon with a +1 or higher enhancement bonus, not counting the enhancement from masterwork quality), certain types of weapons (such as slashing or bludgeoning), and weapons imbued with an alignment."
The Shillelagh is a weapon with a +1 or higher enhancement bonus, and is therefore a magic weapon. Can a club be a magic weapon and a nonmagical club at the same time?
The target of Heat Metal is "Metal equipment of one creature per two levels, no two of which can be more than 30 ft. apart". If I cast it on the metal equipment of two creatures twenty feet apart, and then they both back up ten feet, does the spell end since the metal equipment is now the metal equipment of two creatures forty feet apart?
Liveoak has a target of "Tree touched" and a non-instantaneous duration. When the tree becomes a treant, is it no longer a valid target for the spell, and does the spell end immediately?
Animate Object targets an object, and causes it to become an animated object; an animated object is a Construct, and therefore a creature; an object is defined as 'not a creature'. An animated object is therefore not an object; is the animated object no longer a valid target for the spell, and does the spell end immediately?
-Hyp.