Here are two examples:
1) The so-called liturgical Nazis who wrote to Rome to report every "abuse" of the post-Vatican II liturgy they witnessed. Few people ever witnessed a "clown Mass" but liturgical conservatives use it as the example par excellence of the evils of Vatican II.
2) The Vatican-mandated witchhunts of the American religious sisters who took to heart the recommendations of Perfectae Caritatis, the decree on religious life and implemented changes in their organizational structure, in their charisms, and their calls to work outside the traditional teacher/nurse occupations.