Narrator: There is not one universe. There are many. A Multiverse. We have the technology to travel between universes... But travel is highly restricted and policed. There is not one you. There are many. Each of us exists in present time, in parallel universes. There was balance in the system... But now a force exists who seeks to destroy the balance... So that he can become The One.
In the penal scene with the pyramid, Yulaw knocks a person off the pyramid, and he rolls down the steps. A short way down, he stops rolling, and you can see him push himself off another step to get himself rolling again.
In the gunfire scene at the prison, at the beginning of the movie, when the sergeant yells to two of his men "Woo, Scott, follow me," it is a clear joke from director James Wong to fellow moviemakers John Woo and Ridley Scott.