The literary term for that is "hooptedoodle". In a story, it is the author showing off, interjecting himself into the story and thereby breaking its continuity. Of course, the Mass isn't technically a story, but the principle is the same: The hooptedoodle in the ego-driven prologue interrupts the flow of the mass.
“Hooptedoodle’’. I’ll have to remember that one, thanks. Say, you aren’t THE Jeff Chandler, the famous actor, are you? Man, I loved you in “Merrills Marauders’’. So where you been all these years?