Other mistake: At the beginning, when one bad guy is sitting on a bench with a newspaper, we can read the date October 21, 1959 at the top. But, we also read Nov 3 1970 on the same page, under the mugshot of the Boss being released from jail. (00:04:20)
Continuity mistake: When Surley is in the tree getting ready to lower himself to the nut cart, after dropping Buddy in the bucket, he puts a spool of thread onto a small branch and there is nothing else on the branch. Next shot, there is a clothespin on the branch behind the spool that he moves to the front to hold the spool in place.
Other mistake: In the scene when Fingers and Lucky are going over the bank heist plan, Lucky is wearing a blue suit where the sleeves go all the way down to his hands, but in a close up when his hand and a bit of his arm are seen, but the sleeve is missing. It reappears in shots afterwards.