Having taken a diff,
http://www.ladylittlefox.com/10_abs_32-64.jpg
, I can
see several artifacts that are easily attributable to random numbers,
specifically the aliased edges of approximately everything.  However, there
are huge differences at:
1) the inner edge of the annular caustic around pixel {490,490}
    (unexplained sharp edge in "32 bits")
2) the inner face of the left-rear retaining wall
    (much brighter in "32 bits")
3) the floor under the cage in the lower-right
    (too hard to tell what's happening by eye, so probably not important)
The above all appear to be in shadow volumes, but the next one does not.
4) a series of (differentially) red and green spots on the illuminated side
of the "rocky" cylinder.
    (easy to see in the "32 bits" image when you know where to look)
and
5) The set of jitter errors in the marbling on the lower-left wall appear to
be organized on a perspective grid.  This may just be an illusion.
6) The translucent sphere in the top-right also has a high energy feature.
It's not clear if the shadow feature is jitter on both edges that are so
close together that it't "all jitter".  However, the light on the bezel
behind it is much dimmer in the "32 bits" image.
-- Eric Towers
    fuz### [at] bigfootcom

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