U.S. Air Force insignia on the stock footage C-47 transport plane changes position. When the aircraft is in flight the insignia/logo is more toward the center of the fuselage. As the aircraft lands in Florida the insignia is after the cargo doors closer to the tail.
When Chaz and Sally Mae make it out of the swamp and to a nearby convenience store, it is getting almost pitch dark. When they leave in the newly purchased pickup truck and are on the road it is obviously night time. Cut to LeRoy back in the swamp singing "Runaway" and we see it is still daylight when it should be night as well.
When Chaz and Sallie Mae make it out of the swamp to a small store, there is a television playing news about Marilyn Monroe , and the proposed invasion. The television is a 1970s model table top. It should be a late 1950s or early 60s black and white as most programming in the early 1960s was black and white.
During the trip from Panama on the C-47, stock footage is used to show the plane in flight with Air Force decal on the fuselage. Glickler on the dvd commentary states the stock footage is from ?Tora Tora Tora (1970). Since the plane has Air Force insignia the pilot should be dressed in some viable Air Force uniform, but he appears in rag tag clothing.
The C-47 bringing Chaz and LeRoy back to Florida has Air Force insignia and is making an international flight. It would most certainly have a copilot rather than the lone pilot.
Although the story takes place in 1961, Leroy Beecher as well as the CIA are using M16 assault rifles. Produced since 1960, the M16 became an assault rifle of the US Army in 1964 (three years later).
The story is set in 1961 Florida. The big yellow Ryder van the bad guys use is a late 1970s model Chevrolet moving van.
Right after Ken Wahl kills the snake in the swamp, a crew member with a blue hat can be seen moving through the brush behind Annie McEnroe.