Travis steals a bike and drives to the Packhorse Cafe. As he rides in, there are no cars parked near the café. In the next shot, when he gets off his bike, there's a car in the background that wasn't there before.
The Master in charge of College House comes into the Hall with the other teachers and the Whips. As they walk down to top table you can see that the boys have their doctor's notes on the tables in front of them. In the next shot, looking at the table with Bobby Phillips at the end, the papers have disappeared.
The boys order coffee at the Packhorse Café. The waitress pours the coffee into two cups and slides the cups towards the boys across the counter without spilling the coffee. Travis adds sugar to his coffee from a sugar tin. He spills some sugar and several small drops of coffee onto the counter. The spoon is left in the sugar can pointing towards the café entrance door. The boys then take their coffees away from the counter and walk towards the tables. The next shot shows the waitress standing behind the counter watching the boys. There is now a long streak of coffee on the counter which wasn't there before and the spoon in the sugar can is now pointing in a different direction. There is also no sugar spilt on the counter and no small drops of coffee either.
When Bobby Phillips is summoned by Rowntree back to the Whips' study, there is a Yale-type lock on the outside of the study door. The next shot of him entering the study taken from inside, shows the lock on the outside of the door missing.