The four door blue Ford car used by the two "bad" guys and Shelley Fabares in the scene near the end where they leave the airport together changes from a newer looking clean, dark blue to a dustier, lighter blue car and then back again to the dark blue sedan during the duration of the chase.
Bo Hopkins character states that they have two kilos of heroin left to ship. The method they use puts about an ounce behind the mirror in a makeup case. At that rate, it would take about 70 trips to smuggle two kilos.
This was before fresh-faced Shelley Fabares had her nose narrowed and cheekbone implants inserted. (The latter can more easily be corroborated when looking at pictures of her in her 70s.)
Cult series' fans will recognize Carl Franklin from The Fantastic Journey (1977), in which he would star 4 years later.