On 2007-10-14, Doug wrote:

I just pulled out a standard outlet in our bathroom to replace with
a GFCI. Got the GFCI in fine. However, apparently the load side
powers our hallway's three way switch (which has there separate
switches) and then runs into a bedroom and provides lighting there.

I believe the NEC requires that the circuit serving a bathroom
receptacle either (1) serves only bathroom receptacles or (2) serves
only loads in that bathroom. So you need to run a new circuit for the
downstream loads, in addition to investigating how the downstream
loads are miswired.

Cheers, Wayne