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I've been looking through the GCF (mainly the skins) and I'll just list some things I found odd/interesting:
The Combine Advisor pod is numbered with human figures.
Alyx has a different model for the intro but I can't see any difference between the skins.
A wierd (possible normalmap?) this is there for a squashed antlion grub.
Breen, Kleiner and Eli all have new face textures
The g-man's eyes have changed colour, the no-longer match Gordon's green.
The striped-soldier skin appears for some reason.
Stalkers have eye textures for some reason