What were some of the changes in the Liturgy between the Tridetine Mass and the current Norvus Ordo?
Answer This reply is lenghty but this is how messed up it is. This important and revealing study is commonly known as the Ottaviani Intervention and is often cited by many who promote the Tridentine Rite of Mass. What is not well known, is the fact that this study was actually commissioned by Archbishop Marcel Lefebvre, who assembled a group of 12 theologians from Rome and wrote it under his direction. Cardinals Ottaviani and Bacci then wrote the introduction and presented the study to Pope Paul VI [cf. A Short History of the SSPX]. Letter of Cardinal Ottaviani and Cardinal Bacci to His Holiness Pope Paul VI Rome 25 September 1969 Most Holy Father: Having carefully examined and presented for the scrutiny of others the New Order of Mass (Novus Ordo Missae) prepared by the experts of the Committee for the Implementation of the Constitution on the Sacred Liturgy, and after lengthy prayer and reflection, we feel obliged before God and Your Holiness to set forth the following considerations
