Audio problem: Each time George mentions Millie's older brother Luke, the movements of her mouth don't match what's being said. It appears that the name was changed and then dubbed afterwards.
Audio problem: When Daisy is at the bar (acting), she gives Walter "5 reasons men come to a bar." When she says "Three: They wanna see that they're missing," her lips are not in sync with the words. It's tricky to see because they used a shot with the camera behind her.
Chosen answer: The Song is Callled "Boom Boom Ba" and is by the band Metisse. it plays at certain points during the series. Mainly when George is looking over Reggie or in Reaping Havoc where it plays whilst shes showing her scrapbook "Mysterious and Reassuring" which is what she thought Betty was.