When they are chasing the stolen cruiser and go through the stop sign, the footage is sped up to make it appear as if they are moving faster.
At the mortuary, Malloy observes evidence of the doors being pried open and are unlocked. Reed does not relay to the back-up officer of pry marks but tells him only of the door being open. It changes the situation: an open door could mean the owners merely forgot but tool marks definitely means a break-in.
Instead of entering the mortuary with the silent alarm call, Adam-12 and the back-up responding unit could have set perimeters at building exit (choke) points challenging anyone leaving the building.