Production and Collaboration
The cameo was a collaboration between HBO and Netflix. According to reporting from Vulture, the appearance is tied to Damon's upcoming appearance on the seventh season of the Netflix show "My Next Guest Needs No Introduction with David Letterman," which is scheduled to air later this year.
Executive producer Kate Churchill stated that the idea was proposed by production supervisor Leah Baker. Churchill noted, "It was a kind of hysterical moment when our production supervisor Leah Baker came up to me on set and was like, ‘Well, I have a kind of funny, interesting question: Would you like Dave Letterman and Matt Damon to be background on our set one day?’”
To ensure the cameo was not distracting, Churchill decided to film the appearance in a controlled manner during a shot of the main street that required background actors. The project required coordination between studios regarding scheduling and payment, as Damon is an A-list star. Churchill said, "There were a lot of emails going around, but people really locked arms, and both studios saw that it was a fun collaboration where we could help each other."