If the movies are watched from the 1-6 perspective then there aren't any inconsistencies. But a lot of OT fans hate that because of the "surprise factor" which I can understand. You just have to understand that some things seem inconsistent if you insist upon watching in "surprise order"

Things like recognizing R2 aren't an issue because from 1-6 order, you flat out KNOW 100% that he is at the very least playing coy. We KNOW he is very familiar with astromech droids. Whether or not he technically ever owned a droid isn't really an issue.

But those who are making "Surprise preserving" edits won't need to worry about changing these because you'll still be on a 1-6 perspective.

Another example being. "The Jedi Master who instructed me" If you hear that as a stand alone line, its natural to assume a training relationship that is different than the dynamic we see in the prequels.

However, if the prequel training dynamic is your original base perspective (What you KNOW) when you get to Hoth, then that line will sound like a perfectly reasonable effecient way to tell Luke what he needs to hear right at the moment.