The movie’s script was in Aramaic and Latin. Interestingly, the Latin parts were not in the Classical Latin of Jesus’ day but in Liturgical Latin, which emerged during the Middle Ages.
Faccem musicum!
Which is probably something it got wrong. Romans and Jews in first century Judaea almost certainly would have spoken Greek to each other, not Latin.
Classical Latin of Jesus’ day but in Liturgical Latin, which emerged during the Middle Ages.
Ecclesiastical Latin and Classical Latin are really just two pronunciation styles, both of which were attempts to reconstruct the Latin pronunciation of Cicero's day. Ecclesiastical Latin pronunciation dates back to the English monk Alcuin in the 9th Century, who did his work on a commission from Charlemagne. "Classical" Latin pronunciation was developed by Erasmus in the 16th Century. Latin scholars generally agree that Erasmus got closer to the correct Ciceronian pronunciation.
Obviously it's all reconstruction and educated guesswork, since nobody alive has heard an actual Roman from 2000 years ago speaking Latin.