Ben Savage also played the younger version of a character played by Mandy Patinkin in Nelson's Sparrow (2015) and Face Off (2020), 2 episodes of Criminal Minds.
The jazz musician in the Moscow nightclub is Kamasi Washington, an American jazz saxophonist. He has multiple awards including Emmy, Grammy, and many more. He has recoded with Kendrick Lamar, Run the jewels, St. Vincent and many others.