Jasjeet uses a walking cane with engraving on the shaft. The engravings are visible when Jasjeet opens the door to cross the bridge between the Petronas towers with Deepu. However in the very next scene when Jasjeet is fighting with Vijay, Jasjeet has a cane with a silver knob without any engravings.
During the opening fight sequence the African man dies and falls on the floor. While falling he messes up the carpet on the floor. However in the consecutive shots it can noticed that the carpet has been re-arranged.
During the climax scene fight sequence Don and Vardhan fall down at the same. When they fall down Don is wearing his jacket. However when both of them get up at the same time Don's is no more wearing his jacket. Don would have no time removing his jacket while Vardhan is attacking him furiously with a knife.
In one scene as Don goes to the safe to lock his DVD, Edvard Munch's painting "The Scream" is seen in the background (implying he was perhaps involved in its theft from Munch Museum in 2004). However, the painting had been recovered by the release of the movie. The Filmakers cleverly used this in the UK promotion of the movie by suggesting the recovered painting was the fake, and the painting in Don's safe was the original.
Vardhan/De Silva tells Jasjeet that he escaped via sewage cover before the van explodes, during the action sequence at car park). However in the flashback scene when the van moves from position there is no sewage cover visible.
After being captured by inspector Malik, Don desperately tries to explain that he is Vijay and not Don. Mysteriously Don does not mention about Deepu or Roma either of whom could have easily identified him as Vijay.
In the climax fight sequence it is clearly visible that Don's revolver is not loaded. Also while Don's revolver chambers are facing towards Vardhan and it is very surprising that such an intelligent criminal does not recognize that his opponent is holding an empty gun at him.
After the song 'Yeh meda dil' Don confronts police while holding Kamini as hostage. In this scene Vardhan is pointing an empty revolver at Don. It is ironic that Don does not notice an empty revolver (with revolver chambers facing him) while he himself is trying to escape with an empty gun.
When Don throws his suitcase towards Jayraj there is a blast and both Jayraj and his pattern are engulfed in flames. In the very next shot Don's car emerges from the flames from the same blast. It would have been impossible for Don to throw the bag, get in the car and drive his car through the flames from the blast with in such a short time.
After Ramesh's death inspector De Silva finds out about Kamini despite the fact that Ramesh kept his personal life secret. Strangely during the entire movie De Silva has no clue that Roma is Ramesh's sister. In addition no one in Don's team knows about Roma as well.
After the gun battle at the end of the song 'Aaj ki raat' an asian man helps Vardhan escape from the parking lot. In the same fight sequence, at the end of gun battle the same guy shoots Vardhan in the chest for no reason. More surprisingly Vardhan shows no signs of pain or discomfort for the entire sequence (except few initial moments) despite being shot in the rib-cage.
In the scene after the horse race Roma shoots two policemen. While she shoots the policeman she is on the back seat of the car. But in the next shot when the car is being driven away it can clearly noticed that there is no one in the back seat.
After Narang introduces Roma and Don, Roma attacks Don with a paper knife lying on the desk. When the scene begins the paper weight is on the right side while the paper knife is on the left. But when Roma picks up the paper knife to attack Don the paper knife and paper weight mysteriously switch sides.
After killing Jayraj and his pattern Don is chased by police on a beach. There are several distant shots of this chase. However in none of the shots Jayraj's burning car or his and his partner's dead bodies are seen.
In one scene Don and Roma have furious fight in a abandoned train. At the end of the fight their hair are messed up.However in the very next scene when they are talking to Vardhan their hair perfectly done.
During a video conference between Singhania, Narang and Roma the number from which Singhania is calling begins with +91. +91 is international code for Indian phone numbers yet on the screen it is shown that Singhania's location is unknown.
In one scene Don and Roma escape police in an open top car. While in an open top car their hair are messed up. However in the very next scene they have their hair perfectly done. While Don is eager to let his team know that he has regained his memory, they would have little or no time to do their hair.