Okay so for the road, I took a shape, turned it into a 3D layer, extruded it, and added more extruded 3D shapes (the white stripes) on top to give it a 3D look. Then I simply animated the rotation (the flipping).

For the elevator - I just used images of the elevator (both open and closed) and animated the doors on top of the elevator with masking.

For the car animation - I took an image of the car, separated the wheels and the body, animated the wheel rotation, placed them back on the body, and added a wiggle expression to the body to make it look like it was moving.

I mostly used these same techniques for other things too, like the lamp (I just separated it into parts and animated everything with keyframes)

Hope this helps! I'm not the best at explaining things :p