When it says Randall is the lead scorer, they all look look at mike pilin up the scream cans real fast. Then sully comes out and says "slumber party". Those canisters came out of nowhere, if you play it in slow motion, a can reappears hooked up to the door when his hands come back to grab it it.
okay, I have two solutions for this. #1--maybe someone was standing behind the door, putting in the canisters as the others got filled. #2--it's supposed to make you believe that no matter what, sully will always be the best scarer and randall can never beat him as top scarer.
Wrong! This is not a slip-up. The canisters are behind Mike. You can see them clearly, especially in frame by frame. He always reaches in that direction and when he is done, there are none left!