My A# was wrong on both I-485 receipt notice and FP notice.
I called the immigrantion service center, and one week later, I went to infopass to ask the officer to correct that typo. The local officer told me my A# had been corrected in their system.
On the FP date, I told the officer in the FP office that my A# on the PF notice is wrong, the officer verified my A# and I saw him typed the correct A# in the PF computer system.
Based on my experience, to make sure the error has been corrected, its better to call them first and go to infopass several days later to confirm.