Corrected entry: In Arthur's dream, everyone keeps making the point that there's no gravity. This is false, as even if you were a million miles from the nearest particle, gravity would still be affecting you. Technically, they are not even in free-fall, since wind resistance is still applicable. On a non-anal note: When Arthur is fighting the projection in the hotel hallway, gravity appears to shift multiple times, throwing the two against the ceiling and wall. After Arthur defeats the projection, he enters the hotel room and he is again floating.
Corrected entry: Cobb says that he can't see the faces of his children in his dreams because the last image he saw of them in real life was from behind. This doesn't make sense because his mind could easily reproduce their faces from his numerous memories of them. If his dreams were limited to the last image he ever saw, then everyone he dreams about should only be represented exactly the way he last saw them, which would mean Mal should look dead in all his dreams.
Corrected entry: When Cobb, Saito and Eames meet Yusuf, Cobb tells him that there are five of them who will be entering the shared dream, and Saito corrects him that there will be six. The only way that either number could have been reached is by including Ariadne, and it is subsequently made clear that she was never intended as a participant, and only enters the team when Cobb refuses to tell Arthur about his own subconscious.
Corrected entry: After Cob and Arthur leave the helicopter towards the start of the movie, there is an overhead shot of a city at night. In this shot there is the Eiffel Tower implying they are in Paris. Soon after, Cob says he is going to Paris to get an Architect yet this is where he already seems to be.
Corrected entry: During the scene at dream level three, when the team misses the first kick of the van falling off the bridge, Cobb says that they have time till the second kick of van hitting the water. How is that possible when he is at the third level of dream and the van got in the accident at the first level, where he is in sleep and unaware of what's happening around him? How could he have known that the van went of the bridge and into the water?
Corrected entry: When the van rides off the bridge in level 1 this creates the first shock, which would normally bring the characters back from the second level, but this doesn't happen because they are still in the third level of the dream. Cobb states: "We missed the shock, but there's a second shock when the van will hit the water." But what about Arthur (the character left behind in the second level to get them back from the third), since he was in the second level when the first shock occurred, shouldn't he have woken up in the first level? If this is true it would mean that he couldn't create the shock with the elevators, meaning the other characters would be stuck in the third (or fourth) level.
Corrected entry: The machines which allow individuals to dream the same lucid dream are equipped with timers which wake the dreamers after a predetermined amount time without them having to receive a physical kick. So all the drama in the hotel and in the van about how to make the kicks happen was entirely superfluous since the dream machines they were hooked up to could have simply woken them at a predetermined time without needing to blow anything up, or crash any vehicles into any rivers.
Corrected entry: At the beginning of the movie, we are shown that a person can be woken from a dream by giving them a "kick" OUTSIDE of their dream. This is demonstrated by Cobb being woken up from his Japanese temple dream by being dunked in the bathtub in the South America dream (Japan was dream level 2 and South America was dream level 1). However, the final "riding the kicks" sequence contradicts this by showing everyone getting a kick WITHIN a dream to wake up to the previous dream. Example: When Ariadne was inside Cobb's apartment (dream level 4), she jumped off the building which woke her up to the snow fortress (dream level 3). As she fell through the collapsing floor of the fortress, she woke up in the elevator (dream level 2), and she returned to the van (dream level 1) by falling inside the elevator. If the movie was consistent in its logic, Adriadne and the others should have been woken up from each internal dream by falling in the outer dream. The most likely reason why the writers couldn't keep this logic was because it would have prevented Cobb from staying in Limbo (i.e. the falling snow fortress would have woken him up).
Corrected entry: "The kick" is the feeling of falling that is supposed to jolt a person awake. As demonstrated by Yusuf, even with heavy sedation Arthur woke up every time he started falling from his chair. Yet at the start of the movie, Cobb fell all the way into the bathtub before waking up. And it wasn't the fall as much as the water that woke up Cobb (water began to spray inside the Japanese temple, meaning that Cobb was still dreaming when he hit the water and was incorporating the sensation of the water into his dream). In fact, why was the bathtub even needed if all it takes is a fall to wake someone up? Wouldn't it have been safer to place Cobb's chair on a padded carpet to soften his fall, rather than have him choke on water and risk drowning?
Corrected entry: In the staircase paradox scene, when Ariadna and Arthur were at the end of the staircase, it seems that the staircase is moving upwards but in real the staircase is static its just the camerawork. You can also see that the railings of the upper part of staircase is not matching with the railings of the lower part. (00:40:10)
Corrected entry: At the very end when Cobb finally gets home, Michael Caine goes outside to get the children and says, "Look who's here." When the children come in, Cobb pick ups up his daughter first and the son is on the ground. The camera then goes to Michael Caine for a second. When it goes back, Cobb's daughter is on the ground and Cobb's son is in his arms.
Corrected entry: In the dream level where they are in the snow after the forger fights the guard and shoots him he is seen sliding down the hill past the main building however in the next shot he is standing next to it planting the bomb on that same building he just slid past.
Corrected entry: In the scene where the Van is rolling, whilst Arthur is about to fight the black security guard with the gun, he forces the gun out of his hand as he gets it out and it is left further down the corridor. Next when they slide into the room the gun slides in with them through the door even though it was dropped much further up the corridor.