This is very particular and resembles a lot to the "FBI Code" that Lil does in FWWM. Remember this scene?
![Image](https://pbs.twimg.com/media/DEzJfT8UMAAsHuR.jpg)
[youtube]https://www.youtube.com/watch?v=-dNwFVk68PI[/youtube]
![Image](http://media.vanityfair.com/photos/5963a22a3a5a726a87a62fed/master/w_690,c_limit/tp-fist-squeeze.gif)
This may seen something "casual", but in both scenes we can hear the same song: Deer Meadow Shuffle! Which is more than casual, specially knowing how much effort and attention Lynch put to this.
So, this may open a lot of possibilities, maybe it's only a wink? How can Bushnell know about this? Or maybe.. all the "Dougie" scenes we are seeing are part of something more, something else..