When the officer tries to disable the bomb, the read out displays 19 seconds. After he drops it, the display shows 29 seconds.
After the police find Lana's SUV and Clark arrives, it shows the headlights off, and when it shows the headlights in the next shot, after Clark runs away, the headlights are now on and no one entered the SUV during that time.
When the male cop enters the code on the bomb the time is :18 left until the bomb explodes, in the very next shot he sets the bomb down and the time is now :29 and has stopped the countdown, yet the bomb still goes off.
During the tussle between Greg, Sheriff Adams , and Deputy Harris, Sheriff Adams gets shot but Officers, no matter the type, don't enter a pressure situation without a vest.