Two of the Military Intelligence operatives in the communications room are named as Green and Hills, a nod to the writers Sidney Green and Richard Hills. Sid and Dick are also the duo during Eric's espresso bar singing scene.
Eric and Ernie perform the famous "Danse des petits cygnes" from "Swan Lake" during the Covent Garden-set opera finale.
Eric's quip about the pill bringing "express relief" is a reference to an advertisement for an antacid indigestion tablet in circulation at the time: "Settlers bring express relief!"
The Cyrillic writing on the rear of the backdrop screen at Covent Garden seen when Eric and Ernie are being chased by staff says "Swan Lake".