Audio problem: When Scott says "On top of everything else, there was a full moon last night" his mouth is out of sync. (00:32:15)
Audio problem: As Scott waits by the liquor store counter, as the woman being served speaks, her mouth is out of sync. (00:17:25)
Answer: Because Lewis knew that Scott wasn't being true to himself by letting the Wolf take over his personality. Lewis, like Boof, liked Scott for who he was as a person, not as a werewolf.