Applying for industry job after accepting postdoc offer
After accepting a postdoc position, it is not necessarily appropriate to keep seeking a faculty position.  This might be appropriate if the faculty position was expected to start far in the future.  The fundamental difference between a faculty position and an industry position is that industry positions are usually intended to be filled in about a month, while faculty positions are filled after somewhere between a few months and a year.  This allows the faculty position to be accepted without conflict with the postdoc position.