When Olga meets her sister in the casino, her top has wet patches on it well before Svetlana spills her drink over her.
The half million dollars in Svetlana's bible appears to be in 1000 dollar bills. $1000 haven't be printed since 1945 and were removed from circulation in 1969. A half million dollars in $100 bills would be 50 packs of 100 bills and would weight about 10 pounds.