IME/O authorities these days probably know more about you than you do yourself, before you even walk in the door. So interviews are not about ascertaining facts as such, they are more about piecing together any remaining aspects of your profile that perhaps don't immediately quite fit obviously together, or are out of the mainstream.
A computer has already flagged up any such dis-connects, questions to ask/such 'buttons to press'. Sure they'll start by questioning the very basics, and onwards upwards. But lie at your peril, as they already have 90%/+ of the facts independently confirmed, and are simply figuring out anything 'non-standard', and much of it is sniffing for lies.
Same at Immigration in the UK [Customs Red Channel], US, Israel, and so on...
FWIW: There's no particular pattern to those countries, but together with SG they're the only ones where I've had interviews at their embassies and/or borders/ICA etc... only comparator between them is, they're security conscious countries, my time/pattern there was probably not that of an entirely regular visitor, and hence I didn't tick the regular boxes... AND, they already knew that via independent channels, and hence was flagged up.
