Audio problem: Harlin Rule, the bad guy in this episode is a singer. When he sings his lips frequently don't match the words being sung.
Audio problem: When Harlin Rule is playing the flute by the pool, he stops playing it, but the music continues even after the flute is away from his lips.
Answer: There is no logical reason. Any normal person would notice these type of absences. The show employs a "suspension of disbelief," which is a literary device where the movie audience or a book reader accepts that certain things are unreal for the sake of the story to be told. It is similar to no-one noticing that Clark Kent looks exactly like Superman because he wears glasses.
raywest ★