The first boat Travolta looked at was described as having "twin V-8s" but on the trailer in the driveway is revealed to have a single screw. Also, it had only one set of controls.
During the DEA meeting putting the case together they show a slide from a horse race. The agent mentions the horse is "Winning the Breeder's Cup last Spring."
The Breeder's Cup is an end-of-the-year championship that is always held in Oct-November.
At approximately 1:29:50, someone with the DEA is typing a "SUBPOENA," on a typewriter. They typed, "SUBPEONA," clearly misspelled. The camera holds on the word for about two seconds.
When Ben is driving the 4 door Mercedes at night, after receiving a garbage bag from guys on a boat, he reaches down to turn up the radio volume. The radio has a Chevrolet emblem on it and it's obviously not a Mercedes dashboard.
Near the end when the white Mercedes is pulling into the office, the license plate registration shows Collier county. Miami-Dade area is not Collier county.
At approximately 1hr 8 minutes John Travolta (Ben Aronof) and Michael Weston (Shelly Katz) are seen getting out of a Jaguar XJ (X300) this car was made from 1994 to 1997, a few minutes later we are told the year is 1987.
Don Aronow (Ben Aronoff) was murdered in 1987. The cars in that scene are period-correct for that time. However, the boats playing around off the beach in 1962 both had modern outboard engines, not period-correct.