When Shawn's dad gives him the insurance bill and leaves you can see clearly that Shawn is looking down at the bill. However, immediately after that, when viewed from another angle he isn't looking at it and then looks down.
When Shawn is on the phone with the dog walker, you can see the home screen of his iPhone. This shows that he's not actually in the middle of a phone call.
During the chase scene, the rear window of the blueberry is shown as being intact during some of the shots after it is broken.