Toward the end of Episode III when Darth Vader is in the Jedi Temple wreaking havoc with the 501st Legion, he enters a room where many of the padawans are hiding. One of them asks him, "Master Skywalker, what are we going to do?" Anakin was never given the title of Master by the council.
Was this just something padawans were supposed to do? Address those more learned in the Force as Master, regardless of their 'rank'?