Synthesized answer
The provided passages do not contain information about what questions remain unanswered in the book "Insight and Illusion: Themes in the Philosophy of Wittgenstein." The passages are from a description of a different book, "Wittgenstein: Comparisons and Context" by P. M. S. Hacker [Passage 1].
This description outlines the contents of Hacker's volume, which includes comparative studies of various topics in Wittgenstein's philosophy such as psychology, grammar, and intentionality [Passage 1]. It also mentions Hacker defending his own Wittgensteinian conception of philosophy [Passage 1]. However, it does not list any unanswered questions from "Insight and Illusion."
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Wittgenstein: Comparisons and Context by P. M. S. Hacker Description: This volume collects P. M. S. Hacker's papers on Wittgenstein and related themes written over the last decade. Hacker provides comparative studies of a range of topics—including Wittgenstein's philosophy of psychology, conception of grammar, and treatment of intentionality—and defends his own Wittgensteinian conception of philosophy. Categories: History Pages: 279 Snippet: This volume collects P. M. S. Hacker's papers on Wittgenstein and related themes written over the last decade.