Last scene in the movie they are marching the villain off to the car. He has his hands behind his back as if cuffed but clearly no handcuffs are visible. In fact the split second before he gets into the car, he unlinks his 'cuffed' hands to reach into the car.
During the shootout at the hotel, the helicopter is an Eurocopter A350, but when it has crashed, the wreckage is quite clearly a Bell 206.
When Templar is standing underneath a tree at the end of the film, part of his beard is gray, which it wasn't just a few seconds earlier.
Whilst fighting The Rhino, Simon Templar's hands switch from being cuffed behind to cuffed in front.
The gold bricks featured near the start are clearly nothing like the real weight of gold. They should have gone with gold-painted lead.
Gold bars of the size shown would each weigh 75 kg (ca 150 pounds), so the Saint could not pack 12 of them in bag, and even if the bag could hold 900 kg (ca 1800 pounds), he could not lift it, even less with one hand.
Young Simon Templar could not have seen the tattoo on his father's killer's forearm. Templar was standing behind the killer, who showed it only to Templar Senior and rolled down his sleeve immediately after.
When Templar shoots at the helicopter, his automatic handgun spits out approximately twenty bullets without a reload.
The AK-47 held by the Russian soldier at the meeting at the beginning of the film has a Romanian "dong" hand guard, not the palm swell hand guard a Russian AKM would have.
During the helicopter shootout at the hotel, the bad guy in the helicopter is firing a 7.62 mini gun. The sound effect for this gun is incorrect. The sound effect used sounds more like a single barrel, cyclic action machine gun, say a 50 caliber browning, or other single barrel one shot at a time automatic weapon. The sound for a mini gun is a medium pitch buzz due to the rate of fire: 2000 to 4000+ rounds per minute.
When Simon Templar first meets Patricia Holms in Rub Al-Khali desert in Saudi Arabia, he said, "Three dead bodies 60 miles south of Baghdad." As the great desert is in the southern region of Saudi Arabia, the distance is more likely six hundred miles from Bagdad, Iraq.
The Rub Al Kali desert is over 800 miles from Baghdad, Iraq not the 60 miles claimed in the film. The terrain featured in the movie does not reflect that of southern Iraq were it so close.