Captain McNeil's name is on the door glass reading from left to right from inside his office. There would be no reason to inform people already in McNeil's office that they were in McNeil's office.
In numerous occurrences of emergency vehicles responding, the distinctive tone of the Federal Signal 'Q' siren can be heard, even when it is not mounted.
Sometimes during a car chase, a car may explode after hitting something. This is improbable, since petrol is not explosive.