What Kailey writes on her letter to Quinn inside the pick-up truck doesn't match what he reads on the paper. She writes 'she slept on top of the pool table' then folds it up and slips it in the envelope. But when Quinn reads it the following morning, he reads "she slept on top of the table for a few days and then was gone. She played lots of pool." He then proceeds to read something written on the back of the paper to which we had no knowledge of her ever writing since she just folded up the piece of paper and slipped it in the envelope without turning it over.