If this is related to a licensing exam or knowledge test, then anything goes. So I'll answer according to my own training and experience in the corporate jet environment. Training at FSI, CAE or Bombardier are all remarkably similar in regards to SOP and CRM philosophy. Industry standardization of a sort I guess.
I agree that the PNF should crosscheck switch positions and things like flap and stab trim position indicators, etc. Over the years a number of notable accidents have involved non detection of miss-set controls or switches. In spite of training and apparently proper attitudes toward flying, distractions and external/internal pressures can induce errors in the performance of even very simple tasks such as verifying a switch position.
"Expectation error" is also an insidious mistake waiting to strike the complacent or just plain tired pilot. Here, you see what you "expect" to see regardless of the reality. Gear indicators, flaps, anti-ice etc. All have been "seen" to be in the correct position when in fact they weren't and become accidents. Crosschecking by the other crewmember somewhat reduces the likelihood of such errors going undetected.
A good (evil!) sim instructor knows how to set crews up for this error and learn 'em a lesson! (usually by wearing them down with abnormals and distractions)
westhawk