Continuity mistake: At the campsite, Binford counts out 19 uncut diamonds that were "found" in the salted field. When that same stash is laid out on his desk later, there are 20 stones. And according to Heyes and Curry, there were 21. (00:33:50)
Continuity mistake: At the bank, we see Curry empty the jewel bag onto Binford's desk. Ten stones fall out. But in subsequent close-ups, there are twenty. Despite this, Heyes asks Binford to write a receipt for "ten little stones that sparkle and glitter a lot." (00:12:20)
Continuity mistake: Having borrowed the valuable uncut stones from Soapy, Heyes and Curry don't seem able to keep a very good accounting of them. Ten are sent out for evaluation, and twenty-one more are used to salt the fake diamond field. They should be returning thirty-one nuggets to Soapy at the end of the con game. Yet there are fewer than twenty diamonds on the table when Soapy empties the cloth bag. (00:49:50)
