@TheVorlon said:

All the flashbacks to ten years previous looks a lot like the 50's.

And a robot made out of 60 year old car parts? Nothing from the 80's or 90s laying around? Not even an old Prius?

This show is situated on Earth-2. Excerpt from "Arrowverse Wiki":

While Earth-2 is more scientifically advanced than Earth-1, stylistically, Earth-2's Central City has a late 40s-50s aesthetic mixed with futuristic, presumably as a reference to the real world 1940s and 1950s (also known as the Golden Age of Comics). During this time, The Flash character was first created, with Jay Garrick as his first civilian identity.

Although the above refers to Central City (Flash), one could assume that other places in the USA on Earth-2 would also have a mix of 1940s-1950s look.

It'll be interesting to watch out for the similarities and differences between Earth-2 and Earth-1.

Of course, it can be just a'goof'.