A cut appears on Max's arm before we see that the hitman has a knife.
When Max is stumbling back to the table with the tray of feed at the skating rink, you can see the tape below the drinks that are keeping them stuck to the tray.
Outside the school, Andrew bums a cigarette off a student and then asks for a light, which the student refuses to give him. A short time later, inside the school, he pulls a lighter from his pocket to light the same cigarette.
Annoyingly frequent.