With the graphical plymouth splash, if you press escape to show the details then escape to go back and then escape again, you'll end up seeing the details printed a couple of times.
hrmm, so i guess we need to pause logging when replaying the details.
So I changed the way the details are printed in 0.5.0-0.2008.10.08.1 which should fix this issue. If you still see this, please reopen.