The shop owner tells Trudy and Gina that the 17 year-old hooker hung around with another girl, yet earlier she already found out the girl was a man in drag. Referring to a man in drag as "a girl" would have been appropriate for the era, and also because the person would be identifiable from afar as "a girl" rather than as a man.
In the last scene Frank turns left and drives into wall. In next shot, just before the crash, Frank turns right.
When Frank Tepper drives off to escape in the race car, he turns right out of the straight on a short access and then right again onto an open northbound Biscayne Boulevard. During the Miami Grand Prix, Biscayne Boulevard southbound served as the long straight, and was barricaded off from regular traffic. Northbound served as vendor and sponsor areas. There were also Jersey barriers lining the street for safety, along with banners, grandstands, tents and such. While they are normally removed for regular use, they would not have been removed and normal traffic resumed that quickly after the race ended. There would have also been huge crowds of people still milling around and some headed back to cars to leave. Crockett and Tubbs could not have driven right into the track from the way they came. The access point was the southbound lanes of Biscayne Boulevard under the MacArthur Causeway overpass, but there were still Jersey barriers to prevent inadvertent entry by the public. This is also the location of fire trucks and ambulances which would not have been able to leave this soon after the race had ended.
At the end of the race, the winner is either directed to the winner's circle, if there is one, or the Start/Finish line, while all over cars are directed into the pits, as the entrance is before S/F. As such, only the car of Danny Tepper (Danny Sullivan) and Derek Bell would have been on the straight. No other race cars, police cars, track vehicles, etc. would have been there.
In several shots, they show cars pitting on the driver's right side of the lane while cars went by on the left. The actual pits were a separate lane and the cars pitted on driver's left.
When Frank Tepper makes a left off of Biscayne Boulevard under the MacArthur Causeway in his escape attempt, you can see a real police car holding southbound traffic at Biscayne Boulevard and NE 13th Street. You can tell as while the movie police vehicles come down for the chase, the real police car remains at the intersection and holds the public traffic. Both the southbound and westbound traffic are not moving.