Fala Chen's scenes in the original Sales clip of "Prominent Family" were replaced with Rebecca Zhu for the version that was aired on TVB Jade.
Related post: "Prominent Family" @ TVB Sales Presentation 2012
Related post: 《名媛望族》 "Prominent Family" Costume Fitting Pictures
Personal Note: Do not see the point of having Rebecca re-shoot those scenes, since it is known that the content of Sales clips does not necessarily correspond with the series themselves. The edited version ended up being choppy and more difficult to comprehend. 囧!
*Credits to HKLOVE.org