Mario's romantic encounter (Millicent Kent) is a post-1993 addition.

This is material that was added after the early draft: absent from the 1993 manuscript, present in the published novel.

In the published book. Scene 37 (pp. 121–126)

Evidence. Independently corroborated. Documented by Steven Moore's first-draft collation; Paul Debraski's survey of the draft record ("Mario's encounter with Millicent Kent").

Further notes. Relevant to the W4 Mario spine: his one quasi-romantic beat is late-added.