I've noticed that priests tend to get tripped up when they are reciting Trinitarian prayers. These malaprops is usually unintentional. For instance, the formula for baptism does not have an "amen" at the end of it, but some priests feel compelled to add one anyway. Also, they tend to say "In the name of the Father, the Son, and the Holy Spirit," rather than, "In the name of the Father, and of the Son, and of the Holy Spirit." Now, the shortened version isn't exactly heretical, but it is more ambiguous, I think. And then there is the Final Blessing at Mass, when the priest says, "May almighty God bless you in the name of the Father, Son, and Holy Spirit." There is no "in the name of" in the text.
There is one instance where the mischief is intentional--that is the Doxology at the end of the Eucharistic Prayer. I've probably mentioned this one before. In order to avoid so-called "exclusive" language, they will say something like, "Through God, with God, and in God,...." Which wrecks the Trinitarian form of the prayer.