Seems to me like all the information asked was part of the application and is valid for asking at the interview.
In-law birthdays: G325A
Previous addresses: G325A
Current / previous employment: I864 and G325A
Income / tax data: I864
Stocks / 401K/ broker: 864 (if you use assets as qualification criteria)
I think the moral of this story is make sure you know all the info you put on those forms inside and out before the interview.
DO: Las Vegas, NV
Day 001 - 07/11/06: Sent package to Chicago
Day 003 - 07/13/06: RD
Day 024 - 08/04/06: FP completed
Day 077 - 09/26/06: Interview letter received
Day 120 - 11/08/06: Interview Date - Approved
Day 130 - 11/18/06: 2 year GC received in the mail
Moved to Atlanta, new DO
10/7/08 - I-751 to Vermont
11/17/08 - Biometrics (again?!)
5/25/09 - Got letter saying 751 approved
6/12/09 - Got permanent GC in the mail