In the grocery store, Beatrice brand milk can be seen. This brand is only sold in Canada.
In the beginning of the movie when dispatch calls Eagle 4, the microphone he picks up is connected to a Federal Signal siren. That microphone only works the siren's PA, it does not work the radio.
While in dress uniforms, neither the Sergeant nor Captain are wearing rank insignia. Also, an officer was killed yet no one wears the black mourning band on their badges.