When his mom goes into Chase's bedroom to answer the cell phone (at around 23 mins), the notebook is at the foot of the bed rather than a foot from the footboard as it was (at around 22 mins) when Chase went into the bathroom. When Chase emerges from the bathroom and returns to his bedroom (at around 30 mins), the notebook is still at the foot of the bed, but the bedding is an inch or two lower than it was before, clearly exposing the top crossbar of the footboard that had been out of sight before.