Spirits of the Dead (1968)
During the Saturation Chamber sequence, Famke Jansen is shown as a little girl bouncing first a ball, then a severed head. This is a reference to Fellini's Toby Dammit sequence in Spirits of the Dead.
This film was feature in this episode.
Nino Rota's music for Fellini's episode "Toby Dammit" is featured in the opening credits