There are 3 places in Statue where the word "картофель" - Russian for "potato" - is faintly written on stone blocks. Half of it is cut off. In each case the full word is actually there which can be seen in the Setup Editor by deleting a tri like in the 4th pic. Why was this done? I have no idea.

GoldenEye texture match found. The floor of the shed in Statue comes from the Wraptures Volume One CD. The original 1024x512 image was compressed horizontally to make it square, then sized down to 32x32 pixels.

In Runway there is a long thin cliff triangle, highlighted here in blue, that uses a different texture from all the others. It could be a hint, albeit far from conclusive, that Runway once used this texture for its cliffs. #2 pic is what Runway looks like with the other texture. #3 pic is final game

Perfect Dark has quite a few unused models. This microscope was intended for dataDyne Investigation, but not used for unknown reasons.

There's an unused preset for something about the size of a table in the firing range (the big blue box). I wonder if originally your weapon would have been placed on the table and you'd have to pick it up before the challenge started.

Unused avoid animations in Perfect Dark. There's still remnants in the code for these animations. When CHRCFLAG_AVOIDING is enabled it becomes impossible to land melee attacks on alerted enemies.

Great to see some of Brett Jones’ early concept art for Perfect Dark & GoldenEye on show at the Atkins Building in Hinkley (on until 15 November)