I'm given to understand that at one point David Fincher saw someone watching Fight Club on a plane (an edited-for-the-plane version, on a seat screen), and saw that the aspect ratio had been opened back up from 2.35 (or whatever) to fit the 4:3 monitors on the plane, and dolly tracks and other crew material were repeatedly visible.
...something-something 'aspect ratios really shouldn't be a variable after filmout.'










