The main one I recall had to do with the hide-a-key rock, which Chaw makes a big deal about. Gabe does make a comment about it being "white people shit," which I personally thought was funny. I don't think it was part of any racial unconscious of the film; I think it was a throw-away joke. Chaw seemed to find it... I'm not sure, forced? But his real problem had to do with Gabe's lack of knowledge about it--i.e. if his doppelganger, Abraham, knew it was there, then Gabe should have known too. In all fairness, I think this is something the film is murky on, and I'll be the first to admit that it lets a LOT of things slide when it comes to the logistics of the tethering.
But my problem with Chaw's comment is that Abraham isn't the one who finds the hide-a-key. Addie's doppelganger does, i.e. the "real" Addie--and her doppelganger is the one who says "the hide-a-key."