The notes found inside the bizarre humming tube included a “Cooper Cooper” reference within a bunch of probably non-random numbers, as well as a time and some dates, and some very specific instructions involving dirt going inside their pockets.
It was basically what every Twin Peaks fan has ever wanted to find at the bottom of a cereal box.
As well, Briggs knew that Betty would be getting visited by those specific three men — though she expected a different Sheriff Truman, of course.
Plus, a nod to Jack Rabbit’s Palace, which Bobby was happy about, and a few intriguing symbols, including the one on the aforementioned ring.