I also tried downloading the package and it seems fine to me. Here's what I get:
$ lintian mod-pagespeed-stable_current_amd64.deb
E: mod-pagespeed-stable: unstripped-binary-or-object usr/bin/pagespeed_js_minify
E: mod-pagespeed-stable: embedded-library usr/lib/apache2/modules/mod_pagespeed.so: libjpeg
E: mod-pagespeed-stable: embedded-library usr/lib/apache2/modules/mod_pagespeed.so: libpng
E: mod-pagespeed-stable: embedded-library usr/lib/apache2/modules/mod_pagespeed_ap24.so: libjpeg
E: mod-pagespeed-stable: embedded-library usr/lib/apache2/modules/mod_pagespeed_ap24.so: libpng
E: mod-pagespeed-stable: no-copyright-file
W: mod-pagespeed-stable: extended-description-line-too-long
W: mod-pagespeed-stable: binary-without-manpage usr/bin/pagespeed_js_minify
W: mod-pagespeed-stable: maintainer-script-ignores-errors postinst
W: mod-pagespeed-stable: maintainer-script-ignores-errors prerm
W: mod-pagespeed-stable: maintainer-script-ignores-errors postrm
$ lintian --version
Lintian v2.5.6ubuntu0.1
$ md5sum mod-pagespeed-stable_current_amd64.deb
55761d1da9671123d70eeccdffc37b35 mod-pagespeed-stable_current_amd64.deb
$ dpkg --info mod-pagespeed-stable_current_amd64.deb
new debian package, version 2.0.
size 4957516 bytes: control archive= 4595 bytes.
161 bytes, 4 lines conffiles
573 bytes, 13 lines control
7081 bytes, 222 lines * postinst #!/bin/sh
7258 bytes, 218 lines * postrm #!/bin/sh
271 bytes, 15 lines * prerm #!/bin/sh
Package: mod-pagespeed-stable
Version: 1.4.26.3-r3101
Architecture: amd64
Installed-Size: 12412
Pre-Depends: dpkg (>= 1.14.0)
Depends: apache2.2-common, libc6 (>= 2.4), libgcc1 (>= 1:4.1.1-21), libstdc++6 (>= 4.2.1-4)
Conflicts: mod-pagespeed-beta
Replaces: mod-pagespeed-beta
Section: httpd
Priority: optional
Description: Apache 2 module to optimize web content.
mod_pagespeed is an Apache module that aims to speed up load time of pages by applying web performance best practices automatically.
Are you getting different results?