The changes included in the 1965 Ordo Missae:
According to the link above
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1) Psalm 42 was removed from the "Prayers at the Foot of the Altar"
2) The "Last Gospel" was removed.
3) The priest no longer made the sign of the Cross at the "Adjutorium nostrum" Gloria, Creed, Sanctus and Libera Nos. The five signs of the Cross at the Minor Elevation were omitted also.
4) The "Secret" and "Libera Nos" were said aloud and the "Amen" was no longer said between the "Pater Noster" and "Libera Nos."
5) The priest remained at his presidential chair after the incensing/ kissing the altar until the beginning of the Offertory. And when at the altar, except for the Lavabo and post-Communion ablutions, he remained in the center until the "Final Blessing."
6) The Minor Doxology of the Canon, ("Per ipsum . . .") was to sung aloud by the priest, with the people responding with a sung, "Amen."
7) The Epistle, Gradual and Gospel were said/sung, in the vernacular, at an ambo, facing the people. A lector was to read/sing the Epistle and Gradual. And a weekday ferial lectionary was instituted in 1966.
8) The people were to say all the responses of the server at all Masses.
9) The priest no longer recited the parts of the Mass sung by the Choir.
10) The missal remained in one place from the Offertory to the "Final Blessing."
11) The formula for Holy Communion was changed to, Priest: "Corpus Christi" Communicant: "Amen."
12) The "Leonine Prayers" were no longer said by the priest immediately following low Mass.
13) The people were allowed to recite/sing the "Pater Noster" with the priest.
14) Inclusion of the "Prayer of the Faithful" after the Credo.
15) The use of the vernacular was extended for the administration of the sacraments and various parts of the Mass.
16) The bells were not rung at the beginning of the Sanctus.
17) The rite of concelebration was allowed in all Masses.
18) The priest genuflected after the "Amen" of the people in the Canon and not before it, the subdeacon no longer held the paten before his eyes during the Canon and the priest didn't kiss the paten during the "Libera Nos."
19) Priest and people gave a deep bow at the "Et Incarnatus est . . ." part of the Credo. Genuflection was reserved to the feasts of the Nativity and Annunciation.
20)The priest was given the option of celebrating Mass facing the people
21) Simpler melodies were used during sung Masses.
22) Administration of the Holy Eucharist under both the form of bread and wine (preferably by Intinction).
23) The development of a set weekday ferial lectionary (completed in 1966).
24) The restoration of an "Offertory Procession" where a family from the congregation bring the bread and wine to the priest while the Offertory psalm is being chanted.
25) Implementation of the Psalter for added psalm verses for Introit, Offertory and Communion antiphons in the missal.
26) The altar was to be freestanding.
27) The Communion Procession was restored.
28) The deacon (or priest) bowed to the altar while saying the "Munda Cor Meum" in High Masses, as opposed to kneeling.
29) The rubrics governing bows of the head were simplified
SEE LINK ABOVE