When Danny and Stiles are texting each other on the bus, Danny's messages don't show up on his screen, but they do on Stiles'
When coach is blowing his whistle to interrupt Stiles attempts at getting him to stop at the rest stop, his hand changes from holding and not holding his whistle between the shots in front and behind his head.
It is good to sterilize the needle, but what's the point if you spit the thread.