When North drives his Cobra into pit row prior to the race that Sylvester recalls, in flashback, a Ford badge is clearly visible on the side. In addition, there are several other Cobras in the race, presumably with Ford badges. Later in the film, Strom states that the heist was four years ago (from 1964), and so the race depicted was even earlier than that. Carroll Shelby did not drop the first Ford V-8 and transmission into an AC Cobra until February of 1962, and Ford did not start selling them until later that year.
While the gang is going over the heist plot in the garage, Jack stands up and slaps Sheila with his right hand across her left cheek. When she recovers from nearly falling over, she holds her right cheek. In another shot soon after, she is nursing her bruised left cheek.
Early in the movie, Johnnie comes in off the track after a solo test session. There are no other cars on the track and he has "goggle eyes" i.e. dirt on his face except where his driving "glasses" were. Drivers only look like that after having been in a race. Since he was on the track by himself, there would be no source of that dirt (from other cars).
Although most of the staff and many of the students in the blind school are sight-impaired, all informational signs, names on doors and room numbers are painted, with no accompanying braille information.