When Chief Wiggum knocks out the leader of the meth lab, the meth lab is still burning. The next scene immediately after shows the lab only smoking. While it is possible they extinguished the fire before taking him into custody, it would be unlikely they would leave people inside a burning building while extinguishing the fire.
After Marge's car breaks down, she becomes panicked about their surroundings and locked the doors. But she clearly hits the switch for the back passenger power window instead of the lock switch.