There are two songs that are repeatedly played in the movie, Silence is golden and Dang Nian Qing , both of these songs are sung by the late Hong Kong singer and actor, Leslie Cheung, and the songs are placed in the movie as a tribute to him as he also starred in the original.
In the last gun battle scene, they used world war 2 PPSH sub machine gun while in the original they used more modern MP5.