I'm not sure that the problem building par.exe and static.exe are PAR-Packer bugs - but it's certainly worth mentioning. And I'm not too sure about the problem with @INC, either. It's odd that it only showed up towards the end. But definitely report it, too - and give a copy'n'paste of the 2 error messages (the one relating to File::Temp and the one relating to PAR::Filter::PodStrip).
I think the other 2 points are PAR-Packer bugs ... but there's no guarantee I'm right about any of that :-)