Were I you, I would quietly approach the pastor before the next meeting, and bring up your concerns. Rather than focus on the “legal” reasons why (which he could ignore and pass off as the complaining of a “troublemaker”) instead direct your concerns to the “pastoral needs” of the people – use all the touchy-feely language you can muster!!
Psychoanalyize the “effects” of what happened, and how the faithful were “emotionally hurt” by this, whether they knew it or not. Try to look at the readings again and come up with an aspect of God’s mercy and love that was not revealed to the congregation by the decision (that was well-intentioned of course) to muck up the sequence and confuse the heck out of them.
Sometimes I’ve found this “PC scare tactic” works the best of all…
Then, tell the priest you are planning to bring this up at the next liturgy meeting. Do so, and use an even more heartfelt “PC scare tactic” method, explaining why you feel the people were so hurt by this (don’t mention the Church’s wishes at all… terrorist liturgists don’t want to hear about the “Church” and what the “Church” wants.)
+veritas+