Lawrence D. Guth, in Lecture 9 of MIT's 18.156 Projection Theory course, examines the analogy between the Szemeredi-Trotter theorem on point-line incidences and the exceptional set problem in projection theory. He works through why the classical Szemeredi-Trotter proof technique resists direct adaptation to the exceptional set setting, pulling apart the structural differences between the two problems that make the translation difficult. The session is a chalkboard-style continuation of the course's running investigation into incidence geometry and projections, aimed at students who have followed the earlier lectures on the subject. Expect dense combinatorial and geometric argument rather than a self-contained introduction. Runtime is 77 minutes, consistent with a full graduate seminar session recorded for MIT OpenCourseWare.