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→Emulation issues:
Several problems occur when running PS1 games. And they become more noticeable at resolutions higher than the internal native resolution to many. Though they're still apparent at native, the low resolution's aliasing kills much visibility, hiding the issues.
Jittering textures polygons are another problem. The jitter is caused by low-precision fixed-point (to the native res, essentially) math. And more accurate math where relevant helps, ie [http://emulation-general.wikia.com/wiki/Recommended_PSX_Plugins#Graphics GTE Accuracy]. Though it can often create holes in the seams.
The PS1 hardware didn't have a [https://en.wikipedia.org/wiki/Z-buffering z-buffer]. The lack of a z-buffer causes things like polygons popping over others. Tekken character limbs is a good example to see that.
