The CTO is, admittedly, a work in progress. Over the course of the past few months, we have realized some errors in the rubrics we have prescribed, either from a faulty understanding or out of simple ignorance of some of the finer points of the Tridentine Breviary. Our liturgically astute friend, Rubricarius, at the St. Lawrence Press Blog in the UK runs a sub-blog called the Tridentine Rite, from which the CTO has gained a plenitude of knowledge about the baseline Breviary we employ here.
That said, here are the errata of which we have taken notice and intend to rectify in the daily Ordo entries going forward. This list is in no way complete as other oversights may arise.
1. Concurrence of Semidouble feasts (this includes also Semidouble days within Octaves) with Sundays per Annum. We had been prescribing the use of the Dominical Office as trumping a Semidouble feast in toto at Vespers, but the correct treatment is the mid-Vesperal shift from the Chapter onwards, just as is the case with any two consecutive feasts of equal rank. In our eagerness to accord the Tridentine Psalter primacy of place, we had overlooked this issue.
2. The liturgical color of Sundays per Annum when falling within an Octave. Our 1962ville engrained habits are hard to overcome sometimes, so we had taken it as a given that green was the one and only color a Sunday per Annum could take when the Office was Dominical. The correct treatment is to adapt the color to the prevailing color of the Octave (e.g. two weeks ago, the 13th. Sunday after Pentecost would have taken white as its color due to the Octave of the Assumption).
3. The differences in the length and content of the lessons at Mattins. The CTO has not taken into consideration that the length and content of the lessons at Mattins in 1570 differ somewhat from those of 1910. Pope Clement VIII reorganized and shortened some of these in the 17th. century into the same forms we see in all editions up to and including 1962 (where the lessons still exist in Bugnini 2.0). While this is an erratum if using 1570 as a baseline and should have been noted earlier, we at the CTO will officially accept the post-Clementine lectionary, if only because original 1570 manuscripts are scarce. We see no disruption to the integrity of the Tridentine Office by adopting the Clementine lectionary.
Please, readers, if you notice anything which does not conform to the 1570 B.R., and we have not already addressed it as an adopted deviation from the same, let us know so we can correct it and improve this project.