idk how nitpicky you want, but I got a load of nitpicky stuff.
With basically all the stair models, either their collision goes slightly above the ground they top out at:
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https://steamuserimages-a.akamaihd.net/ugc/957468444749750297/82CB458177A181B08132F7FDD8C4529405C4A5EB/
https://steamuserimages-a.akamaihd.net/ugc/957468444749750941/2F3CB1EBFEAB0F0AE459077A76852FB034297862/
https://steamuserimages-a.akamaihd.net/ugc/957468444749751496/3D612ECC880CABCB389B4F7EF48325834E0B8107/
https://steamuserimages-a.akamaihd.net/ugc/957468444749758513/741BFE3C93DA7D378D86F33F364995FC91AC5B11/
https://steamuserimages-a.akamaihd.net/ugc/957468444749757780/D1A7FBB948EB2C21349A3463C98C63387C885443/
https://steamuserimages-a.akamaihd.net/ugc/957468444749750941/2F3CB1EBFEAB0F0AE459077A76852FB034297862/
https://steamuserimages-a.akamaihd.net/ugc/957468444749751496/3D612ECC880CABCB389B4F7EF48325834E0B8107/
https://steamuserimages-a.akamaihd.net/ugc/957468444749758513/741BFE3C93DA7D378D86F33F364995FC91AC5B11/
https://steamuserimages-a.akamaihd.net/ugc/957468444749757780/D1A7FBB948EB2C21349A3463C98C63387C885443/
or they have a first step before the slope:
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https://steamuserimages-a.akamaihd.net/ugc/957468444749760497/29F287F09C0E15CF5366431E70386D6604AB1CAE/
https://steamuserimages-a.akamaihd.net/ugc/957468444749761887/0F9AE7FF33E7F4010C7CBEA0156EA143E2F60AB7/
https://steamuserimages-a.akamaihd.net/ugc/957468444749762582/B35CC30B7B7AB81AA9076E4E387984212738DBE1/
https://steamuserimages-a.akamaihd.net/ugc/957468444749763128/8F70A29A04900760D4A83CB27E40665C1267F133/
https://steamuserimages-a.akamaihd.net/ugc/957468444749761887/0F9AE7FF33E7F4010C7CBEA0156EA143E2F60AB7/
https://steamuserimages-a.akamaihd.net/ugc/957468444749762582/B35CC30B7B7AB81AA9076E4E387984212738DBE1/
https://steamuserimages-a.akamaihd.net/ugc/957468444749763128/8F70A29A04900760D4A83CB27E40665C1267F133/
Both of these mean that if you jump at just the wrong time, all your horizontal momentum gets eaten; I'm not sure about the second one since I've seen it used by Valve though.
As for visual stuff:
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These overlays overlap instead of being connected
https://steamuserimages-a.akamaihd.net/ugc/957468444749753737/422E3F4F3E7BF7454B05994E63C685B758EB068A/
Fence doesn't connect
https://steamuserimages-a.akamaihd.net/ugc/957468444749754357/DA32A84FAA49BD5BD473CEED5434AFCEE9328C1D/
Example of detail sprites poking through; this happens in quite a few places where displacements are used, though it's mostly noticeable on last
https://steamuserimages-a.akamaihd.net/ugc/957468444749755023/1FB1194C1C4DA6BC64BBD1B48D30A2E33F8C6AF7/
This sign has a dark shadow under it whereas on blue's side it looks fine
https://steamuserimages-a.akamaihd.net/ugc/957468444749755735/7DB8CF7A93D812EEB944189F53869CA2E2495085/
z-fighting in this corner
https://steamuserimages-a.akamaihd.net/ugc/957468444749756721/B733C748AFFCED225E16CDB172B2AAEADA587FF2/
https://steamuserimages-a.akamaihd.net/ugc/957468444749757328/94C220F1A5048A2F93EE3A4B39DA290889A97512/
I'm really not feeling the way the wood and displacement meets, feels like the displacement should cover everything to the right of the support beam
https://steamuserimages-a.akamaihd.net/ugc/957468444749759290/2512FFC19E08DFB13C63613EAB126B697B4E34F3/
Alignment of these textures could be a lot neater; intersection means the trim doesn't go all the way, lower texture looks like it should be shifted to the left a little, and the upper texture could have its scale reduced to fit its inner trim
https://steamuserimages-a.akamaihd.net/ugc/957468444749759768/18E867334A7562517429DB50083129D78A6E5466/
https://steamuserimages-a.akamaihd.net/ugc/957468444749753737/422E3F4F3E7BF7454B05994E63C685B758EB068A/
Fence doesn't connect
https://steamuserimages-a.akamaihd.net/ugc/957468444749754357/DA32A84FAA49BD5BD473CEED5434AFCEE9328C1D/
Example of detail sprites poking through; this happens in quite a few places where displacements are used, though it's mostly noticeable on last
https://steamuserimages-a.akamaihd.net/ugc/957468444749755023/1FB1194C1C4DA6BC64BBD1B48D30A2E33F8C6AF7/
This sign has a dark shadow under it whereas on blue's side it looks fine
https://steamuserimages-a.akamaihd.net/ugc/957468444749755735/7DB8CF7A93D812EEB944189F53869CA2E2495085/
z-fighting in this corner
https://steamuserimages-a.akamaihd.net/ugc/957468444749756721/B733C748AFFCED225E16CDB172B2AAEADA587FF2/
https://steamuserimages-a.akamaihd.net/ugc/957468444749757328/94C220F1A5048A2F93EE3A4B39DA290889A97512/
I'm really not feeling the way the wood and displacement meets, feels like the displacement should cover everything to the right of the support beam
https://steamuserimages-a.akamaihd.net/ugc/957468444749759290/2512FFC19E08DFB13C63613EAB126B697B4E34F3/
Alignment of these textures could be a lot neater; intersection means the trim doesn't go all the way, lower texture looks like it should be shifted to the left a little, and the upper texture could have its scale reduced to fit its inner trim
https://steamuserimages-a.akamaihd.net/ugc/957468444749759768/18E867334A7562517429DB50083129D78A6E5466/