A dial tone is heard after Tubbs uses a car cell phone. Cell phones do not use dial tones like land line phones use.
In the ambulance, the "wounded" officer asks Gina about their surveillance warrants, and she said the prosecutor was talking to the grand jury. This was repeated in a subsequent scene involving the prosecutor and Castillo. In Florida, the grand jury is not involved in that process, as a judge must decide if there is probable cause to issue a surveillance warrant.
Although set before 6 AM, the opening sequence was obviously shot at midday with the sun almost directly overhead.
The pay phones at Tubbs' rendezvous point are obvious props; no wires are connected to them.
At 40:00:00 when Switek is in the van talking about tracking McIntyre, whatever device he was next to him is upside down as the flashing clock numbers are upside down as well.
Diaz calls Crockett and tells him he is a mile past Kendall on the intercoastal. Kendall is inland southwest of Miami and does not border the intercoastal waterway.
Several times it is shows detectives chambering a round in their duty weapon. No cop would carry a weapon chamber clear.