It is impossible to arrive to Cape Horn by car. Cape Horn is actually an island (Hornos), under Chilean sovereignty, seventy kilometers away from Navarino Island, last point where you can find both a car and a route.
Miller describes the Zephyr battery as "the first perpetual energy source since the Sun", however the Sun is not a perpetual energy source. Powered by the fusion of hydrogen nuclei into helium, the Sun will eventually use up its raw materials and die.
June, a Massachusetts resident, tells Rodney that Roy rescued her on "the I-93." Identifying numbered highways as "the" is a California colloquialism. A Massachusetts resident would say "I-93" or "93."
When Roy is flying the plane he issues a mayday call to ATC, he uses the suffix "heavy" with the call-sign of the plane. "Heavy" is given with the call-sign to denote an aircraft with a maximum take off weight above 255,000 lbs which is not true of either the Boeing 727 or Airbus A320.
When we first see Simon in the cab of the locomotive in Austria, he mentions the engine can haul 50,000 metric tons. This equals 55,000 tons in U.S. measurement. A coal train (for example) weighing 55,000 tons would be upwards of 5½ miles long with 20 or more modern locomotives - virtually impossible across even the Australian Outback, let alone the Austrian Alps.
When Roy is driving June in the Volvo after shooting Rodney, he enters a parking building, and when on the top floor he slides the car to align perfectly in a parking space. In the next scene the car isn't aligned and some parking spaces that were not there previously appear as well as some tire tracks.
Towards the end of the movie Roy and Simon are in the engine at the front of the train. June wakes up and goes to eat. Roy and Simon are later seen moving towards the front of the train searching for June who has gone to the rear of the train. Eventually Roy and Simon get to the rear of the train by moving forward.
You see the agent arrive in Spain behind the street festival. Behind him are 2 silver and 1 black SMART cars. Four minutes later he meets Antonio and he leaves the HQ of Antonio. Here are these 3 SMART cars again.
When the FBI reviews the tapes from the diner, the dialogue spoken by Miller is different than in the earlier scene. (Originally he says, "Pie is fine. Pie for everyone. But no Al la mode. Ice cream makes the legs weak..." In the FBI review scene he says "Pie is fine. Pie for everyone. But no ice cream".)
When June is taken to Antonio's home in Seville, Spain, the city is celebrating the festival of San Fermin. Part of that is the famous running of the bulls, which happens in Pamplona, not Seville. Pamplona is in northern Spain; Seville is in southern Spain.
Towards the end of the movie, a sign on the beach lists the distance in miles to Santiago and Cape Horn. In South America, distances would be listed in kilometers. The distance to Santiago is shown as "1279", implying that they are somewhere near Antofagasta, Chile, a Spanish-speaking country. Therefore, the sign should not say "Cape Horn" (English name), but "Cabo de Hornos" (Spanish name) instead.
The end of the car chase in Sevilla Spain winds up at a dock where Fritz and Simon are about to get in an airplane. It is clearly filmed at the dock for the Catalina Island Express Cruises in Long Beach, CA,with the Queen Mary clearly visible in the background.
When June leaves the message for the agents to deliver the battery, she says she is on Route 28, just outside New Hampshire. She meets them on a rural, tree-lined road. Route 28 is a busy thoroughfare, lined with plazas and businesses for miles, on either side of the New Hampshire border.
While on the train, June comments after her phone rings that she cannot answer since that would allow it to be tracked. Cell phones when on are constantly transmitting and receiving radio signals, so it could be tracked as it was depicted.
When the spy planes start bombing Roy's private island, June grabs her purse, which contains her and Roy's cell phones, and they dive into the ocean to escape. In the next scene, she received a call on her cell phone, which should have been ruined after being immersed in seawater.
The bad guy is walking with June through the garden as his henchmen continue to disappear. When he realizes they are gone; he points the gun at June. But the gun he points is empty; the slide is obviously back.
The 727's flight deck has instrument displays seen on modern 737s. The real 727 is an old airplane, with almost no displays. Some modern versions have small digital displays, but not what the film shows. Yes, indeed the flight deck shows modern equipment, but it is definitely a Boeing 727, as can be seen by the fire handles, throttles levers, flap, speed brake and landing gear handles, Flight Engineer's station, and circuit breaker panel locations. The modern equipment only mean that this particular flight deck has been updated with modern EFIS displays.
While the interiors of the plane were shot in a McDonnell Douglas MD-8x mock-up, the plane wreckage in the cornfield is clearly that of a Boeing 727 "Whisperjet," which are no longer used, therefore cheaper to buy for use as wreckage.
June Havens (Cameron Diaz) wears a Rolex Submariner Date in the film. But her stunt double wears a Rolex Sea Dweller Deep Sea. They look almost identical, but the SDDS is much thicker as it's designed to go to much greater depths underwater, and has no magnifier over the date window.