Continuity mistake: During entire scene with dancing king Herod and his men, shadows on the floor are at different angles from one shot to another. (01:16:15 - 01:19:30)
Audio problem: During the song "Judas' Death", Caiaphas sings the line "What you have done will be the saving of everyone", but his mouth is saying " the saving of Israel", the song's original lyric. (01:24:00)
Answer: There are very few (if any) speaking parts in an opera, i.e. all of the text is sung and/or accompanied by music. A musical is more like a play interrupted by songs.
Myridon