I'm not trained in this, but I've developed an interest in color and prop choices after working with a lot of students writing film analysis papers. I noticed a few things and wondered what others might add:
* Jim--both his clothing and his home and restaurant--often appears in shades of orange or tan, which mirrors the color of the chicken he serves. His home has a lot of natural wood and other textures you would expect in an older community. The lighting is dim but warm and yellow. Any decorations on the walls look old and are mostly of people (antique-looking paintings or old photographs). It feels more organic and homey
* Wen--wears blue and his apartment has a lot of shades of blue with some pops of orange (most notably to me on the bed, although Jim's bedspread is also blue, unlike the rest of his house.) Wen's home has faces everywhere: graphic images on the walls, shapes that look like eyeballs, horse heads, a lot of square and rectangular lines. It's darker, less natural light. The electrical appliances stand out
* The police officer's family home is black and white and has a lot of curved/semi-circle motifs: the pot that the plant is in, the pattern of the tablecloth, the way the family members are dressed, the ivory tusks
*In part 4, when we see Wen out at night, he's wearing a striped polo shirt with tan and blue lines
Just interesting stuff to me. : )