Explosives are thrown out of the van when Smith is chasing it along the freeway, but shots immediately after show a clear road with no explosives or smoke behind him.
Fred shoots a lot more bullets than his gun could hold without reloading. This happens more than once.
Whilst Mahoney and Dakota 'Dak' Smith are talking they are out-of-focus in the "...one-man police force..." and "...what do you mean we're out of time..." reprimand scene.
At around 13 minutes - As the cop on the motorcycle stops to go check the van on the road, the doors on the side of it suddenly open, indicating that someone inside the van opened them, but there are two Visible crew members, laying under the van, each opening one door.
While Smith is chasing the van at the start of the film his motorcycle is seen flying off a bridge, but the ramp used by the stuntman to make the jump is visible at the bottom of the screen.
The wooden box that O'Connor is trapped in has soft mesh sides, presumably so that she can breathe. But that meant she could have easily torn her way out at any time.