Comments on "An experimental test of non-local realism" by S. Groeblacher, T. Paterek, R. Kaltenbaek, C. Brukner, M. Zukowski, M. Aspelmeyer, and A. Zeilinger, Nature 446 (2007), 871-875

A simple proof of a key inequality required by the paper’s analysis is presented. An introductory section discussing the paper’s setup may be helpful to some readers. An alternative statistical analysis is suggested.