Look at his projection - everythings streched out east-west. Taking that into account, there's a lot more north-south elongation that immediately seen.Overall, they look too smooth. Maybe more small lakes and islands, ragged coastlines, etc. Also, AFAIK, if ice ages were a dominant geography-forming event in some area, the main shapes should be elongated along the North-South axis (look at Greeland, Britain and Scandinavia).