The song Laszlo is playing on the piano when Guillermo goes to talk to him is "Take My Hand", written by Matt Berry for his show Toast of London (2012)
During the opening credits, every picture that features Colin Robinson either has his eyed covered, or else the picture is removed entirely.
Nadja tries to persuade Laszlo to return to England and suggests they can visit Madame Tussauds. Laszlo states he'll never return to that place again. Before Matt Berry was famous he worked at the London Dungeon, which is a horror version of Madame Tussauds.