A/c does occasionally get moving before all pax are seated and bins closed; as for the wrong safety video being played; this has happened on one of my flights, and one of the crew should have asked the CSD to stop the video and play the right one, so that was indeed a bit of a safety oversight I'm afraid.

Technically, the only part which would have differed from the 777 was highlighting of the exits, and in this case the crew will always physically point these out, regardless of whether the right/wrong video is played.