So, at present, the only graphic glitches should be some little bugs with the translucent shadows and with the sprites/objects scaling code... as far as I know, these "bugs" are also in the MAME emulation...
On the "mobile platform" (second part of stage 2) the characters and enemies shadows are not visible, maybe a priority issue (as you can see in the screenshot 1).
Sometimes, when the sprites zoom, they don't stick well among them and this produces vertical split lines (as you can see in the "blasts" of screenshot 2)... probably a perfectible math for the sprite zooming.
PS: "for the record", these are very minor bugs!