It depends on what your nonimmigrant visa status is now, whether you are subject to the numerical cap, and no doubt many other considerations.

It is unusual, but not unheard of, to get multiple notes of approval. There is no deeper meaning to it, and it is not clear why it happens.

Perhaps if the misspelling is minor, they will accept it at the embassy. Certainly if it is a completely different name, it will be a problem.

Presumably you worked in an underserved area in order to qualify for a two year home residency waiver. If you have not fulfilled the conditions...

There is no impact. Rather, you can contact USCIS to have the update your priority date to recapture the one you already have.

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There is no requirement to be dating one's fiance for two years before filing a fiance petition. Rather the requirement is to have met in person...

It should have little or no impact on one's eligibility for a nonimmigrant visa, the fact that they have a pending immigrant visa that will not be...

Perhaps you could clarify why you filed the form i-824 and what you were hoping to do with it. If you adjusted status and you are trying to bring...

It may be requested when you appear for biometrics. You can file for a replacement green card and then file for naturalization.

It is not unusual, sometimes USCIS cannot match up the different files and they require multiple biometrics.