The working subtitle "A Failed Entertainment" was killed by Pietsch ("it's not" what people should be told they're buying)…

This concerns the book's apparatus (its title, endnote system, or text-state) rather than a single scene.

In the published book. Title page

Evidence. The sources are in tension here. The Lipsky tape settles the title's authorial reality (Wallace calls it "the original title", not a subtitle) without resolving which manuscript state(s) carried it — the title-vs-subtitle wrinkle stands. Documented by D.T. Max's biography of Wallace (Pietsch kills it; it "quietly disappeared from the manuscript"); Steven Moore's first-draft collation (no subtitle on the the 1993 manuscript title page); Wallace himself-side on the 1996 Lipsky tape the Rolling Stone memorial (Lipsky's 1996 tapes): "The original title was A Failed Entertainment, and the book is structured as an entertainment that doesn't work" — Wallace's own statement of the title AND its design rationale, tour-era.