In the party sequence early in the film, we first see (in long shot) a woman who is seated on a sofa with George Hansen behind her. The woman is wearing a blue dress, the top of which is open in front and her right breast is clearly and fully exposed. In the next shot (from a different angle) we see that her breasts are tucked neatly into the dress.
When Mike and George go to relieve the two men at the safe house, we see the four cameras on top of the building all fixed on the same plate that spins back and forth. But when we see the monitors inside the building the video shows the scenery panning in opposite directions from each other instead of being in sync like the cameras are.
In a collision during the taxi chase scene, the front end of the taxi is severely crumpled with the hood popped off and twisted, but in some ensuing shots it is either undamaged or only slightly crumpled.
After escaping the car chase, they are seen driving along the shoreline of San Francisco Bay. This road is actually coming from Fort Point, and there is no way to get to this road from the direction they are coming from.
As they are sailing to the Suisun Bay Mothball Fleet, they are sailing under the western span of the Bay Bridge, then you can see the Golden Gate Bridge off in the distance, which would have been shot from Berkeley, and then they are sailing along the San Francisco water front.
In the beginning as they are driving to the safe house the are driving westbound on the Richmond-San Rafael Bay Bridge. Then they jump to shots of them driving eastbound, and then finally to them exiting the north side of the Golden Gate Bridge.
At the end of the movie, after they have left the Suisun Bay Mothball Fleet, they are actually on the west side of the Benicia-Martinez Bridge sailing eastbound. You can see the Southern Pacific Railroad bridge in the back and you can make out the Mothball fleet off in the distance.
Mike Locken has plaster full-limb casts cut off his leg and arm. These plaster casts are semi-permanent casts meant to immobilize broken bones for long periods of time, from many weeks to several months. However, Mike's casts also cover surgical wounds from the shattered bones being surgically repaired. These surgical wounds have dressings that need changed regularly, probably daily, and would never be so permanently covered.
The opening disclaimer mentions an interview with character Lawrence Weyburn that took place on September 31, 1975. There are only 30 days in September, so this is likely an indication that this is not a disclaimer at all.
One of the characters is shown before, during, and after major orthopedic surgery on his elbow and knee. Following surgery, both the entire arm and entire leg are encased in close-fitting gypsum casts. The intact casts are taken off many days later. Even with today's medicine, this would be impossible: injury and surgery to those joints would cause a great amount of unavoidable swelling that would make close-fitting casts detrimental and torturous. If casts are used today, ordinarily the area around the joint is cut out to accommodate swelling.
In the freighter graveyard scene, Miller holds a submachine gun identified as an Uzi. In fact, it is an Ingram Mac-10 with a cosmetic attachment to make it appear superficially like an Uzi. Furthermore, when first shown in Miller's hands, the attachment is on upside-down, putting the large front sight assembly on the bottom of the weapon instead of the top. In the next shot, the attachment is correctly oriented.
When Mike's semi-permanent plaster casts are finally removed after many weeks or even several months, they cover surgical wound dressings with stitches under them, which are both also removed. Not only do the dressings show no signs of being in place for so long (they look very fresh and clean), but also the skin under the stitches shows no sign of the surgical incision at all, the skin is original and unbroken.
Mac says out of the blue during the taxi chase scene that something is the matter and he stops the taxi and gets out and looks under the car and finds the bomb stuck under the car. However, there is absolutely nothing that could have clued him in to the bomb's existence. It was stuck to the frame and couldn't have affected the performance of the car as he implied.