Found this interesting phenomenon on 'c1a0' map (first map after the train ride) while running in software rendering mode. As far as I explored the map, the artifact occurs only once for the level on this cabinet. This most likely happen because of the incorrect UV texture coordinates interpolation through the triangles. I don't really think that such assumption in texture mapping accuracy was made to speed up the game, then it would also make sense to optimize not only this one object on the entire map. Also, as is shown in the video, FOV values don't affect the appearance so much.
the wiggly worm
I remember similar artifact really perplexed me with a RPG world model in the WON version. I noticed it while running around on an empty Crossfire, and couldn't understand why was it doing that.