When Artie is about to fire the flare gun there is a double parking meter behind him. Then an overhead shot shows him standing six feet further away as he fires.
Alice/Myka is holding the hammer in her right hand, up to the point when Pete is pelting her with table tennis balls. Then suddenly she draws a pistol on Pete and the hammer is in her left hand.
Immediately after Myka has been released from the mirror, her reflection can be seen in the mirror behind Eddie. A Caution sign behind Myka shows the 'reflection' is not reversed.
At the end when Myka is standing in front of the mirror her reflection has her arm over her midsection but Myka has both her arms by her sides.