Please see the workaround at
www.sourcecoast.com/forums/jfbconnect/jf...-to-joomla-34#p51478 for the first warning. We have already checked in this change for the next release of JFBConnect.
The second warning is a common warning that we've seen before with JFBConnect and doesn't cause any functional problems. I wouldn't worry about this one, unless you are having any problems with the site or extension functioning correctly.
-Melissa