Sonic & Knuckles Sphere Combo Bug

This video is companion to the following blog post:
http://hcstealth.tumblr.com/post/100311283757/sonic-3-knuckles-20th-anniversary

In brief, the video demonstrates a bug that was introduced in the Special Stage when the spheres-to-rings code was modified between Sonic 3 and Sonic & Knuckles by first showing the behavior of a stage when played in Sonic 3, and then the behavior of the same stage when played in Sonic 3 & Knuckles