I see a lot of relevant stuff has been posted since yesterday. I don't recall ever doing a full-power stall during my (mere) 500 hrs P2 on the Dak (C47), so am interested to read the comments of Centaurus and Mach e Avelli. There seems no doubt that the a/c got airborne in a stalled or incipiently-stalled condition, left-wing first, and with a lot of power on. Was the power symmetric? Probably.
A couple of posters have commented on the first exclamation from the camera operator early in the take-off run. A closer look confirms that the swing to the left was a lot more pronounced than I first thought. Yes, the tail-wheel lock might not have been engaged, and we have as yet no report of the W/V. Or there might have been a loss of power on the left engine. But if so, why was the take-off not abandoned? Having continued, why was the tail-wheel lifted and then grounded again until main-gear lift-off?
Too many unanswered questions...