(at around 1h 35 mins) When Michael Glass gives Washburn Milena's street address in a telephone message, he clearly says 23. When Michael gets to her house, the number above the door is 14.
(at around 41 mins) When the young nude man is first shown on the bed strangled, his mouth is slightly opened, but when the police arrive his mouth is tightly shut.
(at around 40 mins) When Dr. Glass saw the dead body of the reporter, Adam, Adam's mouth was slightly open. After Dr. Glass picked up the broken Big Ben, Adam's mouth became wide open with his tongue out a little bit.
(at around 47 mins) In Dr. Glass' office, Catherine Tramell drops her cigarette on the floor by the door and steps on it to extinguish it. A few moments later when she leaves, the cigarette is gone.
(at around 1h 22 mins) When the detective picks up Michael to go to a murder scene, we can see that Michael has not shaven for at least a day. When he steps in the car you can see right away that he is clean shaven.
(at around 5 mins) The Daily Mirror newspaper is shown to have a blue masthead. The newspaper actually has a red masthead.
(at around 1h 18 mins) As Dr. Michael Glass is investigating the article entitled "Detective X" by Adam Towers about Roy Washburn, under the sub-headline of Witness Intimidation the article reads "A perfectly good movie script could be made from the information I gleaned in the sewers and alleys and fire escapes of the seedier parts of town." When he reads on to the next sub-headline of the article "Falsifying Evidence" the exact same passage has been repeated: "A perfectly good movie script could be made from the information I gleaned in the sewers and alleys and fire escapes of the seedier parts of town." Additionally, the sentence directly preceding the second sub-headline is incomplete. It reads "Our current political leader" (No punctuation).
(at around 1h 26 mins) A mic is seen reflecting in the mirror as David Thewlis walks away from it.