When Johnny and Hank place the defibrillator pads on the collapsed Jimmy O'Shea, they put one pad on the upper center-left of his chest and the other on the center-right of his abdomen. Any EMT or other trained medical professional knows the correct defibrillator pad placement is upper right and lower left of the patients chest.
At 15:50, Cash (Bill Nunn) calls Brian (Kevin Bigley) by his real name "Kevin".