Continuity mistake: In the first basketball game, after he falls and is then helped up, Scott's fringe keeps changing position. (00:02:50)
Continuity mistake: During the first basketball game, the spectator bench which the mascot is sitting on keeps changing. (00:03:40)
Continuity mistake: When Scott walks onto the stage with the paint cans, the red and white fabric jumps off / on his shoulder. (00:12:30)
Continuity mistake: When Scott asks if Pamela wants a ride to the party, the position and way she holds her script changes. (00:13:15)
Continuity mistake: When Scott is putting his books in his locker and is talking to Boof, he closes his locker. Then in the next shot, his locker is open. (00:34:30)
Continuity mistake: When Scott is running to the toilet, his wolf fingernails are present, then disappear for a shot, then reappear. (00:36:20)
Continuity mistake: There is a scene where Scott and Stiles are talking in the garage. Stiles is standing in two different locations in the garage throughout the scene. (00:38:25)
Continuity mistake: During the basketball game, when Scott turns into a wolf, the Beaver's score decreases from 75 to 62. (00:47:35)
Continuity mistake: When Scott turns into the wolf for the first time in his bathroom, the position of his blue coat on the toilet seat keeps changing.
Continuity mistake: In the scene at the party, Scott is in a large group of mixed people doing party games. He's waiting for his turn to come and he's got wet hair. Yet when he and Boof are going into the closet, his hair is dry.
Continuity mistake: At the very end, Pamela tells her boyfriend to drop dead and walks away, off to her right. But in the last shot where Scott is hugging his girlfriend and his dad, if you look just to the lower left of them, not only is Pamela still just standing there, but she's to the left of where she was standing before.
Continuity mistake: In the final basketball game #23's hair is wet from sweat and gets knocked to the ground by Mick. It cuts to the coach. #23 is standing next to him with dry hair, immediately followed by a shot of him being helped up by his teammates and carried over to the bench.
Continuity mistake: When Scott enters the dance as the Wolf, and he's walking through the crowd, you can see Chubs is right behind Mick and Pamela, and Stiles is next to Chubs. When the shot changes, Stiles is now behind Mick and Chubs isn't seen. Scott walks past Mick and Stiles and in the next shot, he hasn't passed them yet and Chubs is back behind Mick.
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.