Although the Sierra Nevada mountains were covered with glaciers during the last ice age I’m fairly certain the central valley as well as the entire coast were ice free. Unlike what is implied in this GIF.
The Central Valley of California was once an inland sea with a depth of up to 1500'. As the glaciers melted the inland sea filled in with debris from that erosion. It's pretty easy to see evidence of this especially around Roseville where we used to live.
And there's no evidence of glaciation anywhere on the California coast and I've seen a lot of it. But at Yosemite and elsewhere in the Sierra it's obvious.
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.
Ditto. It also doesn’t show the growth of the Great Lakes as the St. Lawrence is blocked by an ice dam.