Yes, there is a fade in effect (but no shaking). It is mentioned in the post, you have to click 'Load 13
more images' at the bottom to see the whole post.
polaroid actually recommended against shaking so I decided to do away with that.. was thinking of adding an accelerometer before that to trigger the reveal
Looking at the animated gifs in the OP, it does appear to "fade in" similar to a Polaroid print.
yes, the camera sends two versions.. one a programmatically slowed down version which fades in from black and a second regular version. The faded one plays once and immediately gets replaced by the second version which then continues playing on a loop.. I decided to cut the length of the fade in short for documentation purposes mostly