IIRC Star road caused scan lines and made weird noises but couldn't play at the moment. I have a weird catagory for the mario hacks, they will either...
48mb
have scan lines and make weird noises (cant play at all)
wont load at all
loads but crashes when selecting a file
loads and plays, but every texture that is not the background or a character model will be white (current problem that hopefully can be fixed)
24mb
loads but crashes when selecting a file
graphical glitches (sm64 the missing star v 1.1) (Damn I hoped this one would of worked

)
loads but is known to crash at certain points
works perfectly
As kyle mentioned in another thread, certain roms might be going above and beyond the limitations of the n64 and unfortunatly never will work.