Visible crew/equipment: Dolly tracks are reflected in all the shop windows as Scott and Boof walk and talk down the street. (00:09:00)
Visible crew/equipment: Stiles is surfing on the top of the van for the first time. The camera cuts to the back of the van, and a police motorcycle can be seen with its hazards on. (00:21:50)
Visible crew/equipment: When the wolf is "surfing" on top of his van, he does a hand stand, and you can see the handles he's holding onto for balance. They aren't there when they are surfing standing up. (01:00:15)
Visible crew/equipment: Michael J. Fox is dancing on top of a bus as the Teen Wolf. The camera swings just a little too far toward the back of the bus and a police car that is escorting the camera car and bus is seen in the rear with its red lights going.
Visible crew/equipment: In the first liquor store scene, Stiles is wearing mirrored shades and is talking to the clerk. He slips the clerk a bribe during a close up shot and the camera can be seen in Stiles' shades.
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.