That's not real champagne being poured into the rock star's bath. As the scene required numerous takes, using the real stuff would have proved far too expensive.
This episode was written by Howard Overman who would go on to create Misfits (2009) three years later. He also wrote the sixth episode in this first season.
Gino mentions Glen Garioch '58, a single malt Scotch whiskey. The Glen Garioch distillery, in the Valley of the Garioch, dates from 1797.
James, the restaurant manager, suggests Bitto Valtellina cheese for the wedding. This is a rare cheese from Valtellina in the Italian Alps, a blend of cows' milk and goats' milk.