The hazardous mine has some interesting ground textures at various spots. EDIT: Other mines have it as well. East Coast has pretty substantial pop-in in the residential areas (West Coast has some as well but not NEARLY as close to the player) EDIT: Noticed some unusual choppy audio while playing on Italy. Can be heard near the end of the video. EDIT2: Barstow has a sort of "popping" sound if you're giving it some gas around ~1000RPM if a supercharger is installed. Video taken with mods but it occurs without them as well.