The first is definitely a bug in Postgres, the only issue is whether it is specific to LinuxPPC, or whether something got broken in PG 7.0.2 (I'm running 7.0).
The second problem falls in the same class, either psql is broken specifically under LinuxPPC or PG 7.0.2 has broken comments on commands.
In the FWIW department, recently MacSlash hosted a discussion on various PPC Linux distributions, and LinuxPPC seemed to cause almost everyone problems. Yellow Dog and a couple of others seemed to work much better. Most of the issues were peripheral-related, though, so this probably isn't terribly relevant.
There is a bugs mailing list for Postgres, and these should be reported there. Folks will try it on non-PPC machines, among other things. You can find this mailing list by visiting www.postgresql.org, clicking on the "information" link, and from there "mailing lists". Unfortunately you have to sign up to submit the bug, but this is the only way they provide to do so.
I'd really appreciate it if you'd take the time to submit these.
