[bdc]

That's because they made an anaglyph (blue/green and red) 3D version of it.
Anaglyph 3D is tricky to get exactly right and it gives you the blue/green and red color inference.
It was originally shot in 3-Depix (single strip 3D-polarized 3D),not anaglyph.
However it's impossible to reproduce the original 3d effect on dvd/bd.

"In order to be projected in the Polarization 3-D process and be viewed with clear glasses, the film required a 3-Depix Reverser to re-order the over and under images into separate projections. Tony Anthony himself was credited with designing a relatively low cost projection lens which made the film marketable for general release."

This was only possible in cinemas equipped with the lens and a silver screen (a white screen would absorb the polarized light waves)
This is also the reason drive-ins couldn't play the regular 3D version since they didn't have a silver screen.