I notice a lot of it happens when Alissa is chiming in, her graphic in the upper left glitches at times, especially when fighting enemies. The panel in the 2nd stage/page(whatever it is), where the Flying Creatures(literally what the manual calls them) come out of a hole, and you need to move a boulder on top of it, while there are 3 stacked on top of each other to the left that you have to eventually destroy. The whole panel glitches as your fighting the Flying Creatures, while those 3 boulders are in view. Things like that. Nothing game breaking, but it can be distracting, and I never saw that kind of glitching in the game until emulation.