Completion/Unix/Command/_django uses 'awk -vdrop...'. This causes completion to fail in Mac OS X (I'm using 10.6.8; awk version 20070501). The man page says there should be a space between -v and the variable name. I just checked on a Linux box, the awk man page says the same thing (mawk 1.3.3-15ubuntu2). Seems to me like adding a space is the safer option.
I have attached a patch to this ticket.