Please read Alexey Sklyarenko's annotations on Pale Fire, Ada and other Nabokov works here.
When Demon Veen (in VN’s novel Ada, 1969, Van’s and Ada’s father) visits Ardis in the summer of 1888 and is greeted by Ada, Van experiences umilenie, attendrissement:
Here Ada herself came running into the room. Yes-yes-yes-yes, here I come. Beaming!
After their dinner in ‘Ursus’ and debauch à trois with Lucette (in VN’s novel Ada, 1969, Van’s and Ada’s half-sister) in Van’s Manhattan flat Ada stretches across Van toward a box of Wipex (apparently, paper towels):
When Van Veen (the narrator and main character in VN’s novel Ada, 1969) describes his nights at Ardis, Ada takes over and mentions a minty whiff of Summer Savory or Yerba Buena on a coastal slope that has to be smelled through the transparency of death and ardent beauty:
Describing his first summer at Ardis, Van Veen (the narrator and main character in VN’s novel Ada, 1969) uses the phrase ya zaslushalsya (I’m all enchantment and ears) and Ada, when she takes over, mentions sverhimperatorskaya cheta (a unique super-imperial couple):
Describing Flavita (the Russian Scrabble), Van Veen (the narrator and main character in VN’s novel Ada, 1969) mentions the Gritz and Venezia Rossa:
After Van’s first night in “Ardis the Second” Ada asks him if he slept his fill:
They stayed on and on, quite unable to part, knowing any explanation would do if anybody wondered why their rooms had remained empty till dawn. The first ray of the morning dabbed a toolbox with fresh green paint, when, at last moved by hunger, they got up and quietly repaired to the pantry.
In his Foreword 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) compares himself to a soft, clumsy giant:
Revisiting Ramsdale in September 1952, Humbert Humbert (the narrator and main character in VN’s novel Lolita, 1955) has an appointment with Mr. Windmuller, the lawyer:
According to John Ray, Jr. (in VN’s novel Lolita, 1955, the author of the Foreword to Humbert Humbert’s manuscript), Rita (the girl with whom Humbert lives after Lolita was abducted from him) has recently married the proprietor of a hotel in Florida:
Describing his life with Rita, Humbert Humbert (the narrator and main character in VN’s novel Lolita, 1955) mentions Rita’s brother, the mayor and boaster of Grainball: