Product Placement Blog ➞ NikeNike Sneakers in Seinfeld Season 3 Episode 21 “The Letter” (1992)December 3, 2019 Sergey TV Show Hi! On Tuesday, December 3, I analyzed a TV Show and product placement was spotted: Nike Sneakers in Seinfeld Season 3 Episode 21 “The Letter” (1992).Here are 4 image(s) below: