Flicky can pick up objects to fire at the cats. When you play the actual PCB, these objects, such as flower pots and hammers, act as if glued to the background.
In MAME, they have a small amount of inertia and 'sway' ever so slightly if you move left and right quickly. It's as if the drawing of these objects is not in sync with the drawing of the background. They do not sway on the PCB.
Verified on an original PCB.
God, I miss those dark, musty arcades ....