Maynard supposedly puts the tape in a portable machine that identifies the tape as a copy. Even though the Betamax tape was analog rather than digital, there is no way that this could be identified as such electronically.
Sonny says they took Stone to 4530 NE 31st Street, which is about 200 feet past the end of 31 St (There is no NE designation in Miami Beach) on the beach right at the water line. The actual runway they used is at an abandoned air strip in northwest Miami-Dade County at the edge of the Everglades on the east side us US-27, called "Opa Locka Airport West." It is actually located 21 miles WNW of the location they say they went to.
You can find it on Google Maps east of the Intersection of Krome Avenue and US-27.
You can find it on Google Maps east of the Intersection of Krome Avenue and US-27.
Crockett lives on the St. Vitus' Dance (the sailboat) under his cover identity of a loose-living playboy who runs drugs. Stone, yelling about him "busting drug lords" would have given this away to his neighbors and anyone else in earshot.