Although Kubrick's daughters' contributions to their father's films as music composer and art direction are credited under pseudonyms, their acting cameos are uncredited.
Numerous observers have seen similarities between Peter Sellers' performance of Quilty-as-Zempf and his subsequent role in Stanley Kubrick's next film, Dr. Strangelove as the titular character.
[1] Commenting elsewhere on the characters, Ciment writes "Peter Sellers prefigured his creation of Dr Strangelove, particularly in the role of Dr Zempf, the school psychologist whose thick German accent recalls that of the mad professor (note Kubrick's ambiguous feelings towards Germany, his admiration for its culture... his fear of its demonstrations of power...)".
[2] Thomas Allen Nelson has said that in this part of his performance, "Sellers twists his conception of Quilty toward that neo-Nazi monster, who will roll out of the cavernous shadows of Dr. Strangelove",[3] later noting that Zempf "exaggerates Humbert's European pomposity through his psychobabble and German anality."
[5] Finally, Barbara Wyllie, writing in Julian Connelly's anthology The Cambridge Companion to Nabokov, speaks of "Quilty's visit to the house in Beardsley, masquerading as Dr. Zempf, a German psychologist (a Sellers character that prefigures Dr. Strangelove in Kubrick's film of 1964).