When Cha-Cha is dumping the contents of the briefcase out onto the road she is standing just to the side of the solid yellow line. In the following wide shot, she is suddenly standing much closer to the side of the road than the middle of the road.
Before The Handler unfreeze time, Number Five picked up Hazel's gun and removed the magazine; later when Hazel tried to shoot the gun was out of bullet, yet there should be one bullet loaded in the chamber as the gun was clearing being fired before time freeze. Also it may be hard to believe a professional assassin can't immediately feel the weight and shift of balance of his own gun without magazine.
The montage during the depiction of Five's career as a hit man gives the impression that the Hindenburg's explosion was caused by a bullet shot by a gun. This is not the case. The cause of the explosion was far more complex and did not include the firing of any guns.
When speaking with Allison, Vanya says, "all of the sudden you're giving me dating advice?" The correct phrase is 'all of a sudden'.
Agnes misidentifies the first bird call she hears during her lunch break date with Hazel. She calls the bird a "red-bellied sapsucker". She is combining names here - the US is home to the red-breasted sapsucker on the West Coast and the red-bellied woodpecker in the eastern US including the Midwest. The call heard is from a red-bellied woodpecker.