Angel's gun keeps changing. She buys a large squareish looking gun with a silver slide and a black body. But when she confronts Stevie in the diner, she has a much smaller all-silver gun (this gun is identical to the gun that nick carries in the final chase/gunfight sequence near the end of the movie). Later, Angel picks up Nick's gun (the all-silver one) because hers is out of bullets, but in the scenes leading up to that moment, sometimes she's carrying her black/silver gun and sometimes she's already carrying the all-silver gun.
When Steve and Tony are walking through the graveyard, you can see the shadow of the camera on the ground.