To change the topic about noticing other things in other shows -- in "The Most Crucial Game," after Dean Stockwell's character is killed and they are at his house, the music from "Etude in Black," is playing in the background. Then it fades out when the bug static takes effect.
Hi Ted - the same Sam Franklin painting also appears in 'A Friend in Deed', on the wall of Halperin's office. It's clearly visible in his first interview there with Columbo (around 33 minutes in).