Continuity mistake: In the scene where Cobra is preparing his weapons in the hotel room, you see him take out three grenades from a bag that is lying on the table inside the room. As the camera changes shot during the scene, you see Cobra remove the third grenade for a second time, even though in the previous shot he has already taken it out of the bag.
Continuity mistake: In the opening scene, a pistol is shown while Stallone does a voice-over. The pistol has the custom Cobra grips on it. If you zoom in on the DVD version, you can see the words "9mm conversion unit" on the slide. Later in the movie, while Stallone cleans the gun (the one with the custom Cobra grips) in his apartment, he removes the magazine and it shows .45 Glaser ammo in the magazine.
Continuity mistake: When Cobra and Ingrid are being chased by the brown sedan and the pickup truck, at one point while the truck is behind him, the guy in the passenger seat puts three bullets into the left-hand corner of Cobra's car boot. Throughout the rest of the chase, these bullet holes are nowhere to be seen.
Continuity mistake: At the end of the super market scene when Cobretti shoots the bad guy, the slide on his gun locks open after his last shot indicating that the gun is empty. Before he puts the gun in his waistband you see that the slide is now forward without Cobretti doing anything to it.
Continuity mistake: For the a good part of the movie, you see many closeups of Ingrid's hands. You see that she has very short nails but when she is in the hotel room on the bed with Cobra, you can see that her nails are long and manicured. Then the next morning her nails are short again. She had no time to have her nails done.