When the mobster empties the Thompson sub machine gun,the shot of the casings shows the brass as crimped,which are blanks.
(at around 1 min) When the Japanese bodyguard fires the last bullet out of the Thompson machine gun, the scene cuts to a shot of the spent bullet casings hitting the ground. As the shells hit the ground, you can clearly see the that ends of the cartridges, where the bullet exits the shell have been crimped, indicating that these are spent blanks. Real spent bullet casings are smooth.
In the opening scene of the warehouse shooting Viggo's character is operating a forklift with no fuel cylinder.