Callahan charges at John holding her hat in her right hand and she grabs him. As John spins her around, her hat has been tucked into her back pocket.
Jamie is getting her hair shampooed; from the front, her hair looks barely wet, even dry in certain frames, but every time they cut to the shot from the back, the person's hair has very sudsy white shampoo covering her head, including her entire hairline.
John speaks directly into the hand-mike when he asks Jaime questions, and he keeps it right by his own mouth through Jaime's answers instead of holding the mike over to Jaime's mouth, so the mike could not have been sensitive enough to pick up Jaime's replies at similar volume to John's questions, the way they are heard on the tape.
Clearly-visible cutouts in the brickwork where Jaime pulls the iron bars out of their mooring in the side of the salon building.
Obviously sponge-rubber top stones on the brick wall that flex visibly as Jaime grips them when she climbs over.
The assassin shoots at Antonio with a revolver with a silencer. Silencers don't work on revolvers. BH.
The tape decks' VU-meter needles do not deflect when the tape is being played back, even though the recorded voices are at full volume.
They give an address of 9th & Delaware in Washington DC they never intersect at all on a map.