Just before Eric Draven kills Tin Tin (the guy with the throwing knifes) he jumps of a roof and lands on his back and he begins laughing. Now when I first saw this I immediately noticed this slip-up. When Eric hits the ground you can see that the "concrete surface" of the street is actually a huge safety mat. Now don't worry, I know they wouldn't really throw Brandon Lee or a stunt man of a roof onto solid ground but c'mon...bad editing...They must of seen that one!