The footage, depicting a man filming his girlfriend on a bicycle, was intended to demonstrate the handset's optical image stabilisation (OIS) feature, but was later found to have been captured using different equipment.
The Verge spotted a window reflection of a cameraman holding what appeared to be an SLR, forcing Nokia to admit that it should have included a disclaimer stating that the video was merely a representation of what the Lumia 920 is capable of.
"We produced a video that stimulates what we will be able to deliver with OIS," said Nokia Blog editor Heidi Lemmetyinen.
"Of course, hindsight is 20/20, but we should have posted a disclaimer stating this was a representation of OIS only. This was not shot with a Lumia 920... we apologise for the confusion we created."
Nokia unveiled the Windows Phone 8-powered Lumia 920 at a joint-event with Microsoft yesterday.
Watch the Nokia 920 advert below: