Joelle's Too Much Fun at Molly Notkin's party (p. 228)
Joelle’s never seen the completed assembly of what she’d appeared in, or seen anyone who’s seen it, and doubts that any sum of scenes as pathologic as he’d stuck that long quartzy auto-wobbling lens on the camera and filmed her for could have been as entertaining as he’d said the thing he’d always wanted to make had broken his heart by ending up.
Context
Joelle climbs to Molly Notkin's party planning her overdose, and the narration lays out what Notkin doesn't know: Joelle lives on the trust of the "infinite jester," the man she unveiled for — the maker of "a final opus so magnum he'd claimed to have had it locked away." This is the book's first physical description of the lethal cartridge's actual apparatus, the "long quartzy auto-wobbling lens," from the only person who was ever in front of it. And the crux of Hal's later misreading is planted here: Jim said the thing was so entertaining it broke his heart.