Please read Alexey Sklyarenko's annotations on Pale Fire, Ada and other Nabokov works here.
In his Commentary to Shade’s poem Kinbote (in VN’s novel Pale Fire, 1962, Shade’s mad commentator who imagines that he is Charles the Beloved, the last self-exiled king of Zembla) quotes the first two lines of Goethe’s Erlkönig (1782) in Zemblan translation:
Line 662: Who rides so late in the night and the wind
Describing his escape from Zembla, Kinbote (in VN's novel Pale Fire, 1962, Shade's mad commentator who imagines that he is Charles the Beloved, the last self-exiled king of Zembla) mentions the Bera Range, a two-hundred-mile-long chain of rugged mountains:
VN's novel Ada (1969) ends in the phrase "and much, much more:"
When Ada refuses to leave her sick husband, Van Veen (the narrator and main character in VN’s novel Ada, 1969) walks some ten kilometers along soggy roads to Rennaz and thence flies to Nice, Biskra, the Cape, Nairobi, the Basset range:
Andrey Vinelander (in VN's novel Ada, 1969, Ada's husband) is an Arizonian cattle-breeder:
According to Ada, she and Van will have four pairs of eyes in paradise:
Nirvana, Nevada, Vaniada. By the way, should I not add, my Ada, that only at the very last interview with poor dummy-mummy, soon after my premature — I mean, premonitory — nightmare about, ‘You can, Sir,’ she employed mon petit nom, Vanya, Vanyusha — never had before, and it sounded so odd, so tend... (voice trailing off, radiators tinkling).
In his Commentary to Shade's poem Kinbote (in VN's novel Pale Fire, 1962, Shade's mad commentator who imagines that he is Charles the Beloved, the last self-exiled king of Zembla) speaks of Charles Xavier’s chaste romance with Fleur de Fyler and mentions his new boy pa
In his Commentary to Shade’s poem Kinbote (in VN's novel Pale Fire, 1962, Shade's mad commentator who imagines that he is Charles the Beloved, the last self-exiled king of Zembla) describes Gradus’ visit to Joe Lavender’s villa Libitina:
Describing his childhood trips with his father, Van Veen (the narrator and main character in VN’s novel Ada, 1969) mentions a cummerbunded Dutchman who told another that Demon was a famous gambler:
Describing the picnic on Ada's sixteenth birthday, Van Veen (the narrator and main character in VN’s novel Ada, 1969) mentions a company of strangers who walked into the forest across the road and sat down there to a modest colazione of cheese, buns, salami, sardines and Chianti: