The Debian packaging of emacs-pg-el is maintained in git, using the merging
workflow described in dgit-maint-merge(7).  There isn't a patch queue that can
be represented as a quilt series.

A detailed breakdown of the changes is available from their canonical
representation - git commits in the packaging repository.  For example, to see
the changes made by the Debian maintainer in the first upload of upstream
version 1.2.3, you could use:

    % git clone https://git.dgit.debian.org/emacs-pg-el
    % cd emacs-pg-el
    % git log --oneline 1.2.3..debian/1.2.3-1 -- . ':!debian'

(If you have dgit, use `dgit clone emacs-pg-el`, rather than plain `git
clone`.)

A single combined diff, containing all the changes, follows.
--- emacs-pg-el-0.13+git.20130731.456516ec.orig/pg.el
+++ emacs-pg-el-0.13+git.20130731.456516ec/pg.el
@@ -2,7 +2,7 @@
 ;;;
 ;;; Author: Eric Marsden <emarsden@laas.fr>
 ;;; Maintainer: Helmut Eller <heller@common-lisp.net>
-;;; Version: 0.13+ (sorta)
+;;; Version: 0.13
 ;;; Keywords: data comm database postgresql
 ;;;
 ;;; Copyright: (C) 1999-2005  Eric Marsden
