Christine orders a Scotch when she goes to the Black Cat Club and the barman kindly obliges and says it is on the house. More like it is from Back to the Future as he serves her a glass of Monkey Shoulder which was only launched in 2005 and this is set in the 1960s. Still, it's a great malt.
When Christine sits at the bar in the basement Jazz club and asks for a Scotch the bartender clearly serves her the 'Monkey Shoulder' brand with its distinctive applied metal bottle logo shown in closeup. Though the show is set in 1962 "Monkey Shoulder" wasn't created and launched until 2005.