About this blogger:
A theorist, organist, and conductor, Jeff Ostrowski holds his B.M. in Music Theory from the University of Kansas (2004), and did graduate work in Musicology. He serves as choirmaster for the new FSSP parish in Los Angeles, where he resides with his wife and children.
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“Oh, the happy choir director who is hired to start work on a brand new choir, or who walks into his first rehearsal a total stranger to the existing group—what a fortunate man he is! The new choir director who is a former member of the choir, or a member of the congregation, or the nephew of the alto soloist, or a former altar boy, or otherwise well acquainted with the choir, is in for a few headaches.”
— Paul Hume (1956)
Editio Vaticana Errata
published 7 November 2010 by Jeff Ostrowski

As great as the Editio Vaticana is, it is not perfect in every detail.

Joseph Gogniat points out that the Vatican Edition sometimes fails to mark each liquescent:

Here is another instance where liquescents are missing:

N.B. This example was taken from Cantus Selecti, which is not (strictly speaking) part of the Vatican Edition.