Question: Obviously I missed a major plot point, so hopefully someone can answer this. How does Dalton Russell know what Arthur Case has in the safety deposit box? Theoretically, only Case would know the highly incriminating contents of his own box. How did Russell find out? Did someone (the rabbi, maybe?) rat out Case? And how did he know?
Question: This movie left me with more questions than answers. Even after watching it more than once. 1.) Was the fake wall built during the robbery or before? If it was built before, how was this done without the bank employees knowing about it? 2.) What was the purpose of the hole they dug in the floor? I thought this was where they stored the diamonds, but Clive would have had to tear up the floor and dig them up again later, which doesn't make sense. Why couldn't Clive have just brought the diamonds with him behind the wall during the escape? 3.) Wouldn't it have made sense to give each person who came out of the bank a lie detector test to try and weed out the ones who may have been involved? I realize that those tests are voluntary, so that in itself may have helped the police.
Question: After the robbery and once the dust settled (business was back-to-normal at the bank, etc.) why did the bank president not immediately go to open the safety deposit box and see what happened to its contents? He knew it was the target of the robbery. Reason would dictate that one of the first things he would have done would be to open the box and see what was there... Not leave it to the NYPD to open it and discover a mostly empty box except for the big ring, chewing gum and note.
Question: Why wouldn't the cops compare bank records/accounts against the name of each hostage? This would have narrowed down who didn't work at the bank and/or have a bank account. This information would give the cops suspicion of the hostages that could have been the robbers, since they didn't work at the bank or have an account, there is no reason to be in the bank in the first place.