Animation Scoop has a neat little interview with Rosa Tran about the animation for that creepy Tulsey Town commercial in I'm Thinking of Ending Things.

Jackson Murphy: How did you and Charlie Kaufman decide to reunite on this?

Rosa Tran: He texted and said ‘what’s up!’ LOL. He reached out to both Duke Johnson and myself, and said he needed some animation done. We both love working with Charlie so it was a happy surprise.

JM: I know in the book the characters visit Dairy Queen. How did you come-up with Tulsey Town?

RT: This is ALL Charlie. When he talked to us about the Tulsey Town spot, he already knew what he wanted. Production even had the logos designs with napkins and bags printed. (Source)

And via r/kaufman on Reddit, here's a commercial that looks a bit familiar: