Pigs and other mammals have dichromatic vision, or only two pigment cones that create colors. This means a pig's view of the world is less rich than a person's, but that a pig can still differentiate colors. Animals with monochromatic vision have only one pigment cone and see in black and white. Therefore Arnold wanting a color TV is appropriate.
When the two bank robbers note that the Douglas farmhouse calls to mind "Tobacco Road," they are alluding to the title of Erskine Caldwell's 1932 novel that was subsequently made into a movie, i.e. Tobacco Road (1941), the plot of which revolved around the hardscrabble life of a family of tenant farmers.
Lisa's ring, taken by the robbers, is insured for $42,000.
Barney and Clyde make off with only $67 from the bank robbery, not including the $5 they stole from Arnold.
Adjusted for inflation, the $67 stolen from the bank, plus Arnold's $5, would equal approximately $660 in the year 2023. The insured value of $42,000 for Lisa's ring would be about $385,000.