Audio problem: In the theatrical cut only, there is a scene where Willow goes into Howie's room and wakes him in the morning. She is heard to say something like "Wake up Sergeant", but her lips do not move.
Audio problem: On his way to check out the school, the Sarge witnesses a group of kids involved in the Maypole song. During the song, a kid with a mouth harp is strumming it every single time he's in frame, but that included large parts when the instrument is in fact not part of the diegetic song.
Answer: He was a devout man of faith. They had to test his virtue, to tempt him to break the ten commandments or the seven deadly sins.