The shopping cart, when the user hits a larger viewport size expands and becomes persistent. This is a nice touch.
The items in the cart show you price, Prime status, and an image thumbnail. Hovering over each product image displays: product title, price, quantity, delete, and “save for later”.
There is also a save for later panel under the cart as well, which expands accordian style.
This experience and the cooresponding interactions are not included on iPad/tablet.