At a lot of live events that are broadcast, the use of taped footage is common. Even when the taped footage is meant to look like live footage.
ie. There was a Janet Jackson concert shot live in Hawai'i. Two identical versions were shot. One was with an audience and one was beforehand without an audience. This allows for certain shots to be inserted into the live broadcast and the DVD that is made afterwards.
I was at the show and when a curtain didn't fall correctly around Janet and just hung there in the first few minutes of the concert, they stopped the show and restarted. I'm thinking there would have been continuity issues if the curtain was allowed to hang there and the curtain was gone in the previously shot footage.
Pre-recorded footage allows the cameramen to get certain shots that they can not get live. Close-ups, etc. They would have had a hell of a time shooting the footprints fireworks with cameras stationed everywhere and helicopters...
And lip-syncing happens all the time. (Whitney Houston's Star Spangled Banner... lip synced.) But replacing the kid with another more appealing kid is just freakin' lame. Reminds me of the whole C&C Music Factory thing, replacing big Martha Walsh with a skinny model for the video.
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