Corrected entry: Stallone uses the wax layer from a drinks carton to place over the keypad to his cell so he can get the 4 digit code, all well and good but the wax sheet is not numbered, so when it is removed he would have no idea how it was fitted on the keypad, leaving him with multiple combinations. When he does escape he cannot see the keypad from his cell and is just using blind luck to key in the code.
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Correction: He made mention that it came to finding the correct sequence. It is never specified how long he worked on it until he found it.
lartaker1975
There's only 10,000 possible permutations. He must have got real lucky.
10,000 is correct for four unknown digits but the wax is supposed to show him which four are used. That's only 24 combinations. That assumes there's no limit on attempts but it's a much more feasible number.