In the I Can Do Anything ad [direct video link], PC shows off what he can do because he is animated. He then talks to a rabbit that is on its way to the Apple Store.
In the Tree Trimming ad [direct video link], Mac and PC are decorating a tree. When PC plugs in the tree, Mac discovers that the lights actually say... well, we don't want to spoil it (sorry!).
You can watch both of the ads by visiting the Get a Mac ad website.
Thanks to everyone who sent this in!