Say the Black, do the Red

Absolutely no other person, not even a priest, may add, remove, or change anything in liturgy on his own authority.  [This authority is reserved to the Pope]

SACROSANCTUM CONCILIUM, III, 22 §3

So whenever Father X changes, neglects, and/or adds words or gestures to Mass he is being disobedient to the 2nd Vatican Council.  It's easy though, all he has to do is say the Black, and do the Red.  (The rubrics are for the priest are written in black and red.  The black is what the celebrant should say.  The red is what the celebrant should do).

This doesn't just apply to priests!  If a lector, deacon, or Extraordinary minister of Communion adds, removes, or changes something then they too are disobedient to the 2nd Vatican Council.