The closed caption said "Bing" and IMDB shows Bing as played by Riley Lynch (David's son). I havent gone back and re-watched the credits of Part 7. According to IMDB, Riley also played a character named Trouble in Part 5, who I don't remember right now.

Posted by: Tom Gordon

The closed caption said "Bing" and IMDB shows Bing as played by Riley Lynch (David's son). I havent gone back and re-watched the credits of Part 7. According to IMDB, Riley also played a character named Trouble in Part 5, who I don't remember right now.

I think the band's name is "Trouble"

The band name is Trouble.  Riley Lynch is Bing per the credits in Part 7.

Does anyone notice that there are different sets of Double R customers (and where they sat)before and after the running dude arrived and asked if anyone seen Billy, as highlighted in this "Wow, Lynch, Wow!!" recap (between 7:08 and 8:07):

https://www.youtube.com/watch?v=nOZTVQ-Hn-w

How does one explain the two differing sets of diner customers? Does it confirm fan theories that TP is being set in two different universes?

This would've explained why there are three different Coops ("real" Coop, Mr. C, and Dougie) existed so far, perhaps two to three different Lauras as well as other show characters as well. There are multiple "doppelgangers" of each characters because each exist in different universes.

That is incredible! Also, I like that the Youtuber highlighted Shelly's reaction. That really brings home the purposeful nature of that trick.

I read this on Film School Rejects' episode 7 recap. Interesting stuff. 

We close back in Twin Peaks at the Double R Diner. A guy runs in asking if anyone’s seen “Bing.” No one has. It seems like a throwaway scene – “Bing” is billed in the credits as Riley Lynch, David’s son and the guitarist for Trouble, who closed out episode five – but look closer. Before this dude runs into the diner, there’s one set of customers; after he leaves, the customers have changed, like physically. It’s a sly, slight shift, one made more confounding by camera angles, but there are three things to note here – one, Shelly notices the shift, you can see the confusion on her face but two, she brushes it off, like it’s a regular thing, or at least not as unexpected as some of the other things that have happened in town during her lifetime. And three, check out the guy in the bottom left of the episode’s final scene, under the “N” in “MacLachlan:” is that Bobby Briggs?