Please read Alexey Sklyarenko's annotations on Pale Fire, Ada and other Nabokov works here.
In VN’s novel Zashchita Luzhina (“The Luzhin Defense,” 1930) among the people who come to the attic (where little Luzhin, who is afraid of school and does not want to return to the city, attempts to hide himself) is the milkmaid Akulina:
In VN’s novel Zashchita Luzhina (“The Luzhin Defense,” 1930) it is a black-bearded peasant from the water mill, future inhabitant of Luzhin’s future nightmares, who carries the boy (who is afraid of school and attempts to hide himself in the attic of his parents’ country house) down from the attic to the carriage:
In his apologetic note to Lucette (in VN’s novel Ada, 1969, Van’s and Ada’s half-sister) written after the dinner in 'Ursus' and debauch à trois in Van's Manhattan flat Van Veen (the narrator and main character in Ada) calls Lucette "BOP (bird of paradise):"
Describing his debauch à trois with Ada and Lucette (Van’s and Ada’s half-sister) after the dinner in Ursus (the best Franco-Estotian restaurant in Manhattan Major), Van Veen (the narrator and main character in VN’s novel Ada, 1969) mentions Ada’s red-lacquered talons:
Describing the difference between Terra and Antiterra (aka Demonia, Earth's twin planet on which VN’s novel Ada, 1969, is set), Van Veen Veen (the narrator and main character in Ada) says that our enchanters, our demons, are noble iridescent creatures with translucent talons and mightily beating wings:
Describing Ada’s hands, Van Veen (the narrator and main character in VN’s novel Ada, 1969) mentions the long, languid, rose-and-silver, painted and pointed, delicately stinging onyxes of Ada’s adolescent and adult years:
Describing his dinner with Ada’s family at the Bellevue Hotel in Mont Roux, Van Veen (the narrator and main character in VN’s novel Ada, 1969) mentions Yuzlik (the director of Don Juan’s Last Fling, a film in which Ada played the part of the gitanilla) and two agents of Lemorio, the flamboyant comedian:
At the beginning of Canto Three John Shade (the poet in VN’s novel Pale Fire, 1962) mentions Rabelais’s great Maybe, “the grand potato:”
At the end of his Commentary 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 a Zemblan saying Gut mag alkan, Pern dirstan (God makes hungry, the Devil thirsty):
When Demon Veen (in VN’s novel Ada, 1969, Van’s and Ada’s father) asks Van if he or his poule had got into trouble with the police, Van replies ‘poule’ with the evasive taciturnity of the Roman rabbi shielding Barabbas: