The way the FD-302s worked is that the date at the bottom next to the word "on" was the date that the interview actually occurred.
No, I don't believe that is correct, and I think you are mistaken.... The date the report was written is right at the top of the report.
Sayer's certainly didn't write the report as he was interviewing Weitzman. He jotted down notes as he interviewed Weitzman on 11 /22/63 ....AND I suspect he read Weitzman's affidavit and THAT may be the reason his report is so confusing. He incorporated information from Weitzman's affidavit with information he received from his interview and he made a mess of the info.