There are no opening or end credits. Only the distributor (EuropaCorp) and the production company (Revolver Pictures Ltd) are credited at all. The ending has several minutes of blank screen and piano music. This seems to be a deliberate choice by the director to reinforce the movie's philosophical themes.
The Netflix version has normal end credits. Over the first part of the end credits, eight different "shrinks" (including six Ph.D.s and one M.D.) briefly discuss concepts in the movie.
There are six title cards carrying quotes (some real, some made up) which appear, the first four before the film starts; the ideas in the quotes are referred to in the dialogue. 1. "The greatest enemy will hide in the last place you would ever look." - Julius Caesar, 75 B.C. 2. "The only way to get smarter is by playing a smarter opponent." - Fundamentals of Chess, 1883 3. "First rule of business, protect your investment." - Etiquette of the Banker, 1775 4. "There is no avoiding war, it can only be postponed to the advantage of your enemy." - Niccolo Machiavelli, 1502 At 1:13 : 5. "The only real enemy to have ever existed, is an internal one." - The Road to Suicide, pg1, line 1 At 1:36 : 6. "Your friends are close, but your enemy is closer." - The Road to Suicide, pg1, line 2