Using https://github.com/stadler/pyrocket/archive/v0.8.tar.gz I get the following:

daniel@daydream:~/pyrocket$ LC_ALL=C bzr bd -- -S -sa
Building using working tree
Building package in normal mode
Purging the build dir: /home/daniel/build-area/pyrocket-0.8
Looking for a way to retrieve the upstream tarball
Upstream tarball already exists in build directory, using that
Building the package in /home/daniel/build-area/pyrocket-0.8, using debuild -S -sa
 dpkg-buildpackage -rfakeroot -d -us -uc -S -sa
dpkg-buildpackage: source package pyrocket
dpkg-buildpackage: source version 0.8-0ubuntu1
dpkg-buildpackage: source distribution trusty
dpkg-buildpackage: source changed by Jackson Doak <email address hidden>
 dpkg-source --before-build pyrocket-0.8
 fakeroot debian/rules clean
dh clean --with python2
   dh_testdir
   dh_auto_clean
pyversions: missing X(S)-Python-Version in control file, fall back to debian/pyversions
pyversions: missing debian/pyversions file, fall back to supported versions
running clean
'build/lib.linux-x86_64-2.7' does not exist -- can't clean it
'build/bdist.linux-x86_64' does not exist -- can't clean it
'build/scripts-2.7' does not exist -- can't clean it
   debian/rules override_dh_clean
make[1]: Entering directory `/home/daniel/build-area/pyrocket-0.8'
dh_clean
rm -f pyrocket.6
make[1]: Leaving directory `/home/daniel/build-area/pyrocket-0.8'
 dpkg-source -b pyrocket-0.8
dpkg-source: info: using source format `3.0 (quilt)'
dpkg-source: info: building pyrocket using existing ./pyrocket_0.8.orig.tar.gz
dpkg-source: warning: ignoring deletion of file find_occurences_of_version_number.sh
dpkg-source: warning: ignoring deletion of file make_source_package.sh
dpkg-source: warning: ignoring deletion of file make_package.sh
dpkg-source: warning: ignoring deletion of file cheeky.xcf
dpkg-source: warning: ignoring deletion of file README.md
dpkg-source: warning: ignoring deletion of file cheeky.png
dpkg-source: warning: ignoring deletion of file clean_source_package.sh
dpkg-source: warning: ignoring deletion of file TODO.txt
dpkg-source: warning: ignoring deletion of directory src
dpkg-source: warning: ignoring deletion of file src/msnmissile.png
dpkg-source: warning: ignoring deletion of file src/40-rocketlauncher.rules
dpkg-source: warning: ignoring deletion of file src/LICENSE
dpkg-source: warning: ignoring deletion of file src/setup.py
dpkg-source: warning: ignoring deletion of file src/rocket_frontend.py
dpkg-source: warning: ignoring deletion of file src/pyrocket
dpkg-source: warning: ignoring deletion of file src/rocket_joystick.py
dpkg-source: warning: ignoring deletion of file src/pyrocket.png
dpkg-source: warning: ignoring deletion of file src/rocket_webcam.py
dpkg-source: warning: ignoring deletion of file src/joystick.svg
dpkg-source: warning: ignoring deletion of file src/rocket_backend.py
dpkg-source: warning: ignoring deletion of directory src/debian
dpkg-source: warning: ignoring deletion of file src/debian/pyrocket.desktop
dpkg-source: warning: ignoring deletion of file src/debian/control
dpkg-source: warning: ignoring deletion of file src/debian/watch
dpkg-source: warning: ignoring deletion of file src/debian/pyrocket.pod
dpkg-source: warning: ignoring deletion of file src/debian/rules
dpkg-source: warning: ignoring deletion of file src/debian/compat
dpkg-source: warning: ignoring deletion of file src/debian/pyrocket.install
dpkg-source: warning: ignoring deletion of file src/debian/changelog
dpkg-source: warning: ignoring deletion of file src/debian/copyright
dpkg-source: warning: ignoring deletion of file src/debian/pyrocket.preinst
dpkg-source: warning: ignoring deletion of file src/debian/pyrocket.menu
dpkg-source: warning: ignoring deletion of directory src/icons
dpkg-source: warning: ignoring deletion of file src/icons/48.png
dpkg-source: warning: ignoring deletion of file src/icons/32.png
dpkg-source: warning: ignoring deletion of file src/icons/72.png
dpkg-source: warning: ignoring deletion of file src/icons/128.png
dpkg-source: warning: file pyrocket-0.8/40-rocketlauncher.rules has no final newline (either original or modified version)
dpkg-source: error: cannot represent change to icons/128.png: binary file contents changed
dpkg-source: error: add icons/128.png in debian/source/include-binaries if you want to store the modified binary in the debian tarball
dpkg-source: error: cannot represent change to icons/32.png: binary file contents changed
dpkg-source: error: add icons/32.png in debian/source/include-binaries if you want to store the modified binary in the debian tarball
dpkg-source: error: cannot represent change to icons/48.png: binary file contents changed
dpkg-source: error: add icons/48.png in debian/source/include-binaries if you want to store the modified binary in the debian tarball
dpkg-source: error: cannot represent change to icons/72.png: binary file contents changed
dpkg-source: error: add icons/72.png in debian/source/include-binaries if you want to store the modified binary in the debian tarball
dpkg-source: warning: file pyrocket-0.8/joystick.svg has no final newline (either original or modified version)
dpkg-source: error: cannot represent change to msnmissile.png: binary file contents changed
dpkg-source: error: add msnmissile.png in debian/source/include-binaries if you want to store the modified binary in the debian tarball
dpkg-source: warning: executable mode 0775 of 'pyrocket' will not be represented in diff
dpkg-source: error: cannot represent change to pyrocket.png: binary file contents changed
dpkg-source: error: add pyrocket.png in debian/source/include-binaries if you want to store the modified binary in the debian tarball
dpkg-source: error: unrepresentable changes to source
dpkg-buildpackage: error: dpkg-source -b pyrocket-0.8 gave error exit status 2
debuild: fatal error at line 1364:
dpkg-buildpackage -rfakeroot -d -us -uc -S -sa failed
bzr: ERROR: The build failed.
daniel@daydream:~/pyrocket$