mverta, I'm also unsure if that shadow was intentional. Before you pointed it out, I never noticed it. Now, I think I notice similar offsets on the sequels (though I can't tell if those are just video chroma shift or color bleeding or highlight ghosting or some other artifact of old video transfers...)

Empire's offset seems to "compress" closer to the main text layer as it gets closer to the middle (possibly caused by anamorphic lens distortion? I know that you can see a pronounced fish-eye effect to the main text layer...). If I futz with the saturation, gamma, etc. on the GOUT, I can see that the "shadow" on the left edge is clearly offset to the right, and on the right, it's offset to the left. On the GOUT, the text on the edges (especially on frame right) have this blobby blue glow/shadow/offset thing, but in the middle, there's almost none. But due to the blurring and diffusion problems with the credits in the GOUT transfers, I don't know how accurate they are.