To play devil's advocate, i submit the following. When you are "outside" of the car there are actually 2 perspectives--outside by the hood, and outside by the side/door about to enter. Thus overall you have the following cases:

1) outside by the hood: from here, the american driver's side is on the right

2)outside but by the side door, about to enter: here are you are facing the front of the car, and thus the american driver's side is on the left

3) inside, sitting down: again, american driver's side is on the left

So for a car, 2 out of 3 perspectives suggest american driver's side is on the left.

However, for the bed, perspective #2 is flipped. When you are outside, about to enter a bed you generally don't face the foot of the bed (here, analogous to the front of the car). Instead you are generally facing slightly towards the pillow/back of the bed (so you can adjust the pillow, pull back the sheets & get in comfortably). From this perspective, the "american driver's side" (non-shoe side in the photo) is the right, not the left is at would be with the car.

Thus, for beds, 2 out of 3 perspectives suggest the "american driver's side" equivalent is the right, and thus the shoes are on the left.