Just set the subtitle language to Japanese and watch a cutscene with a bad line. The lines with this issue are always the same ones, so it's very easy to reproduce.
I have tried software renderer, hw renderers, with hacks, without hacks, with speedhacks, without speedhacks, various rounding modes, interpreter mode, gs hacks, gs settings, etc. I haven't figured out exactly what determines the direction of the tilting, though I'm not sure if it matters. Specific lines of the Japanese language subtitles in Jak 2 (Japanese is available in all versions of the game) have this tilted looks with the wrong textures on the edges.
