For my great grandfather from Italy, who is the one I am claiming citizenship from:
1) He was named Saverio Calabretta in Italy, but this later became Samuel Calabretta when he came to the USA. I would imagine this is a pretty common situation.
2) This is the one I am most worried about. All records I can find for him such as his birth record from Italy, his death record, his grave marker, etc., all have him born in 1896. For some reason, his marriage certificate from 1924 lists him as 26 years old, which would mean a birth of 1898. I have no idea why this is, but everything else on the certificate is correct (parents names, birthplaces, etc). The woman at the courthouse pretty much said there is no way to change a record once it exists

For my great grandmother (who I am not claiming citizenship from):
1) Her name maiden name was Clara Avellino, but it is misspelled on the birth record as Clara Avalina.
2) Every birthdate I've seen for her says Feb 1st 1904, except her "official" birth record which says Feb 1st 1905. Again, this is the same courthouse that told me that records can not be changed.
So.... What can I do now? Just go on and hope for the best? Sign a statement of some sort declaring that these are indeed the same people despite the errors in the records? If it makes any difference, I will be going through the Philadelphia consulate.
Thanks in advance....