If this GIF is meant to mimic the last major glaciation, then it is inaccurate for the east coast also. For example, a terminal moraine for the last ice age is located just north of Morristown New Jersey (meaning this is the farthest south the ice sheet extended). This Gif shows an ice sheet extending several hundred miles south of that point.
In the plains area they have the ice thousands of miles farther south than it got last time.