Talking to a friend about this last night and he said something interesting—apparently at the very end of the theatrical credits of Us, there was a logo for the Universal Studios Hollywood theme park. Not the Universal Pictures logo, but literally the logo for the Hollywood theme park. I never stay all the way through the end credits so I can't say one way or the other, but I found that kind of interesting. I feel like it's probably pretty common, though? I feel like it's just advertising for the park, not an indicator that the movie is being made into an HHN maze.