Kubrick homages the Duel truck in Wendyโs basement. The three dials are an allusion to The Wizard of Oz. This fourth wall break is Wendyโs behind the hidden curtain moment, which overlaps Dannyโs time in room 237.
High Voltage and the โCh-O-Kingโ poster which has been altered to read โsCh-O-Kingโ are references to Al Schockly, Jackโs benefactor, otherwise absent in the film, but the reason there are so many horns in the Overlook. And a statue of a white bull adjacent to Wendyโs head in her first shot in the film.