Back-to-Real-World islanders in disguise: how is this possible?

Sudden flash of lighting: both Walt and Micheal, plus Locke, came back to the "Real World" from The Island at a certain point: Walt and Michael before the rescue of the Oceanic 6, Locke after this.

How is possible that no-one recognized them, even if they were in disguise? I mean: is a fake name enough to prevent everyone to recognize a person? Is really possible that no-one, among people that knew them before, will aknowledge them after?

While Walt was living in his granma house everybody knew he was dead, and so for Jeremy "Locke" Bentham...

I really hope you're going to get what I mean because this thought is making me crazy!

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