Cole says that, exposed to air, K.X. would oxidise and there would be "an exponential increase in molarity". This is nonsense. Molarity refers to the concentration of the compound (in moles per litre). Oxidising it might make it more active but it would increase the number of molecules of the compound or their concentration.
Sami is seen sharing a hotel/motel room with Noor's mother. (There are two large beds in it.) She is a a devout Muslim and would not have tolerated that. Even if he wasn't sleeping in that room, her head wasn't covered with a hijab, which she would definitely have worn while he was in the room.
Javad JUST showed Peter his gun. Peter knocks him down and then runs. Javad apparently forgot about his gun and runs after him instead of just shooting him. And then if he was so desperate to get him, he could have just thrown his arm between the subway doors. Duh.