I am following this since the very beginning.
I recall some problems with early emerging videos of this so called incident. Especially with a missing door on a facade near the emergency exit on the backside of the location.
By chance i stumbled upon this video about "the fake facades of paris".
There are, the video is showing, fake facades over the city masking ventilation tubes for the metro/subway/underground. I wonder, if this could be connected in any way.
(Please note, there seem to be similar underground facilities for much more mayor cities. To keep in mind.)
Edit: Would be nice, if a mod could move this to the Bataclan Topic. Sorry, for that.