In the second scene that takes place at the National Atomic Museum, an educational recording can be heard that says "Germany, headed by Werner Heisenberg, were also undertaking ... [becomes inaudible]" Werner Heisenberg was the German theoretical physicist whose name inspired Walter White's alias.
The band that plays the opening theme "Negro y Azul" consists of two cousins from the corrido-style band Los Cuates de Sinaloa. They are signed to Sony records.
When Badger, Skinny Pete, and Combo are at The National Museum of Nuclear Science & History, the song "Bert the Turtle" is heard. "Tortuga" (played by Danny Trejo) is Spanish for "turtle."
The title, "Negro y Azul," translates to "Black and Blue."
As the scene opens when Jesse is addressing his dealers in the museum, the camera pans away from a TV monitor playing a video. The voice-over from the video can be heard mentioning Werner Heisenberg, who is the inspiration for Walter White's alias.