Punch sounds are heard when no punches were laid.
This is in the American version of the movie. In the original all sounds are fine.
The goof is created by bad dubbing/ sound editing making the movie understandable for that country.
When Rama's face is cut by a machete when hiding within an apartment's wall, it leaves a deep, ragged and swollen wound. However, when he exits the apartment his wound is suddenly much neater and more superficial.
During the execution scene, when the all the rounds in the revolver are supposed to be spent it is placed on the shoulder of the final victim. At this point it's possible to see into two of the chambers, where the tips of unspent ammunition are visible.
The goof item below may give away important plot points.
After defeating Sgt Jaka, Mad Dog dragged the body from the room, through the hallway to the elevator and met Andi in front of it. However, when the shot changed to long shot, the blood trail was short as if the body had not been dragged.