Product Placement Blog ➞ AT&TAT&T in Mr. Mercedes Season 3 Episode 8 “Mommy Deadest” (2019)November 6, 2019 Sergey TV Show Hi! On Wednesday, November 6, I analyzed a TV Show and product placement was spotted: AT&T in Mr. Mercedes Season 3 Episode 8 “Mommy Deadest” (2019).Here are 1 image(s) below: