I actually think is just an interpetation of what actually happened. Okay, that made pratically no sense, so I'll try to explain my self (get ready for a doozey ^_-)
1) Okay, when Sakura lost her memories, Syaoran was unable to 'save' her in a sense, I mean, he did get her to safety, but he lost her feathers in a the process, or something like that, and in the first scene, it shows Syaoran unable to save her from falling to the PITS OF DOOM!!!elevenone! (tm) So the whole message is, that Syaoran was unable to to save her, at the time, it could be a forshadowing in the beginning of the anime/manga, or it could just be a really cool scene that is just the equivalent of what really happened. I hope that made sense.
2) Well, if that mess of gibberish up there isn't the real thing and it's acutally a forshadowing for the rest of the series, so it's the same sense as in, how Syaoran couldn't save her, but this time, even though he got all her memories, and he still couldn't save her, or maybe he couldn't save there relationship, meaning that Sakura wont ever fall in love with him again. As much as I know this seems so farfetched and radical, I thought it made some sense, but before I get smacked and raved on XD, I just wanna say I'm a diehard S +S fan, so if that does actually happen, I'll stab my self, I swear, or at least I'll go crazy ^^
3) It's just a scene to show some more of Sakura's absolutely adorable clothing, even if it was in a span of 2 minutes, long, she still looked adorbale. And hey, maybe CLAMP just sticked that in to show there uber-awesome drawing style, and Bee Train included it just for the heck of it, and maybe get some praises as well ^^ * a stupid reason, I know, but it's possible*
*wears flame-protector*
I feel a fire coming on *runs away*