good job on your work here. i know it can be a daunting task (thats why i stay away haha). one thing i noticed is the stiffness in his movements (especially in his walk, you have his arms moving in a straight line instead of a nice, loose arc). another thing would be around 2 second mark where he nearly trips, it would be good to add a short step forward there to further emphasize the motion of him catching himself.
I'm not sure what's going on around the 12s mark, where he does that hand motion. I'm guessing it's like him pushing the observer (us) away, like by trying to be discreet though it doesn't read well to me. I think that one important thing to fix then would be to aim his eyes directly at the camera, so we know its us that he is brushing off (if thats what you are trying to get at) because right now I can't tell at what or who the gesture is made toward.
I think you've done a good job of blocking in the main animation and now you should work on refining the actions (especially when it comes to emphasizing them (think exaggeration, like in traditional animation) -- I think they should be bold actions, especially towards the end when he tries to open the car door, he should really be struggling with that. ). Push it further

Again good job and keep at it.