Soon after Matt has been shot in the arm, he favors it and is holding it in pain at the cookout. Steve even comments on it. Shortly after the cookout, when he's holding a gun in his hand and aiming it at the old man for a couple minutes, he has no problem, and the wound is not an issue for the rest of the movie.
In the chase scene, they are racing at high speeds yet the buildings behind them never change. Also the scene pretty much ends where it begins.
During the cemetery shootout, the sniper rifle falls off the mausoleum roof but then reappears briefly before the scene change.
When Steve gets shot no blood is visible; he grasps his stomach. In a few seconds later the wound migrates to his heart area and the jacket gets unbuttoned.
The opening graveyard shooting scene has gravestone fragments flying around and bouncing like they were made of Styrofoam.
At the shootout in the cemetery, a man next to the hearse is shot. We see the squib, blood pack, explode through his suit coat, but when he falls and the coat opens, there is no blood on his shirt.
In the shot of the red BMW X5 you can clearly see the reflection of the camera crew in it.
Just before Drea gets shot you can see the crew clearly on the right hand side of screen.