I didn't notice this, a friend watching it with me did.
Whoever remembers the episode a few years ago when the gang when to dinner at a friends house, and Elaine and Jerry went to get a cinnamon babka and George and Kramer got the wine. Jerry ate a black and white cookie and the colors kept reversing.
Well check out Kramer's Lollipop on the Betrayal episode. The colors switch. When they go back to where it's full size in Jerry's apartment, the red stripe is on the bottom. Next shot, the blue is on the bottom.
Pretty funky, watch closely.