Yes. Local consulates are usually helpful in that regard.

Yes, happens all the time. Will then get a letter of denial on the EAD and ap.

Sometimes walk ins prove to be successful.

I agree. Also depends on the nature of the "mistake" if want to wait until interview or file new.

Will be given a second (and last) chance with a different officer.

Will need to file a Motion to Change Venue which will delay things further.

It is your place of residence which defines the location of the court.

Seek to maintain your F-1 (or any other NIV status) for as long as possible, then will not need any H-1B (which you will likely not be able to...

Wife still qualifies, given that UI is also counted as income.

Yes - the case fling notice will follow in the mail - up to 2 months from hence.