That clip is acting very strange; it's getting up to a certain bit rate and then falling back to the lowest one and the overlay is disappearing, sometimes not returning for a very long time (maybe never the last time it went away while I was watching). Try "Example 8 Hour 23.976", the only other clip with those overlays. It steadily climbed through encodes, the overlay never disappeared and it didn't sporadically fall back to super-low bit rate encodes.
I wonder if the short clip's become extremely popular? You mention things in AVS Forum and they spread through the net. After it'd existed for a while, my old list of Netflix titles with 5.1 sound was referenced in countless blogs; I was in a conversation on another site and someone told me about it . I wonder what happens if there's a constant huge demand for a title?