Vi Victor drives an Edsel Citation Convertible, a pretty rare car (only 930 ever made). Edsel was in fact a subdivision of Ford meant to produce "the car of the future". But Edsel was, apparently, too much ahead of its time. The models flopped and the brand was discontinued after only two years.
This film was filmed in November of 1958. The gas station sign outside of the stage coach inn lists gasoline at 27 9/10 cents per gallon. This would equate to $2.50 per gallon in October of 2020 dollars.
At various points in the preparation for the heist, Vi, Chuck and Mike, all check their wristwatches for the time and all three watches are Bulovas.
In O Falcão Maltês (1941), Sam Spade refers to Wilmer as a gunsel. Trivia notes include the following: "The Yiddish term 'gunsel'--literally, 'little goose'--may indeed be a vulgarism for homosexual (the word 'faigle', or 'little bird', is usually used in that respect), but it's more commonly an 'underground' term that refers to a person who is either a 'fall guy' or a 'stool pigeon'." In the case of Wilmer, it is appropriate; in this film, in the trailer dialogue, gunsel is used for its other common meaning which is a criminal with a gun.