I got a notification after the I-485 interview saying that the application has gone to a USCIS office and it is in "initial review". The IO didn't mention anything during the interview. The website says this:
"During this step, USCIS initiates the background checks of the applicant/petitioner and identifies issues that may need to be addressed either during an interview or by asking the applicant/petitioner to submit additional information or documentation. USCIS reviews the applicant's/petitioner's criminal history, determines if there are national security concerns that need to be addressed, and reviews the application/petition for fraud indicators."
Could this mean that there's an RFE possible, or is it normal?