I have worked as a visual fx artist in the past and am familiar with realms such as graphics and lighting. Though editing suites are very different from game engines, I can tell you that some of the mistakes you pointed out are really just molehills made in to mountains.
Also, do not forget that the game is still in a pre-alpha state (or so I read) and refinements are constantly being made.
The gun lighting the back of 47 is either a simple miscalculation in the light radius emission, or deliberately done to enhance the visual style of point shooting.
You're right about the purple light cast on surfaces during what appears to be anything that emits organic light. For example, gun flares, or lighters. See the example I have below, where the same purple reflection is cast on the steel from the lighter

By
asterix645 at 2012-05-05
Like I said, these are minor and are unlikely to have a significant effect on gameplay. Unless you suffer from obsessive-compulsive-disorder or something of the sort.
Personally, I couldn't care less on whether the CO2 ignition of a gun's muzzle causes a purple blotch on the frame. I'm only going to be using the silenced silverballer, which doesn't have a muzzle flare as it is.
The glowing statue is the result of a curvature in the color map of what I think is the alpha channel or the upper curve of the RGB.
This illuminates anything in the frame that is of a white, grey, or pinkish tone.
It also explains why 47's bald pale head is glowing. And the pillar structure in the top right corner is glowing.
I presume these are because of point-shooting, which has stylized visuals to add to the cinematic feel.
but a stone statue should not glow like that
The skin on a bald man's scalp should not glow either, and it doesn't.
These aren't graphical problems, they are
intentional effects caused by point-shooting.
When sneaking through the library, as seen in RFYL, none of these issues are present.
You're argument is making a mountain out of a molehill, as mentioned earlier.

Floating boxes are a simple glitch. You don't honestly expect a bugless game do you? We're only in 2012, lad. Everything is riddled with the occasional bug and glitch.
Edited by Aeseric, 05 May 2012 - 10:26 PM.