FAQ for
The Thirteenth Floor (1999) More at IMDbPro »

There are two elements that confirm this:

1. When Douglas returns from his first trip into the 1930's simulation, Whitney asks him how it was. Douglas replies that people were "as real as you and me" but the colorization was a bit poor (and indeed, everything in the simulation had a sepia tone to it). In the ending scene, we see the same poor colorization in the panorama of LA. 2. The very end of a movie suggests a TV being turned off, akin to the end of a simulation. This may however be construed as the director's way of saying that the movie itself was a simulation, not the world at the end.