Taking the time
The team used the time it took to dig their ventilation holes out to source materials for the rest of the escape. They collected supplies by offering incentives to prisoners in different wings for swiping the things that they needed. They even paid a prisoner to take dark, straight hair clippings from the barber.
Here's Where the Hair Went
The trio made paper mache molds of their heads. Each one was outfitted with some hair that was taken from the barbershop. The idea was that these fake heads would buy them a little time if the prison guards came looking for them and decided to turn around because they were "sleeping in their cells..."