Restore problem from 8.4 backup to 9.0

I installed v9.0 on my Mac Pro.  Dumped the 8.4 database using 'pg_dump -Fc -d dbname --username=xyz >
backup_file_name'using the pg_dump from the 8.4 installation.  I restored the database using 'pg_restore -d dbname
backup_file_name' using the 9.0 restore and after creating a new database under 9.0.  Under version 9.0 the database
looksok, but I had a lot of the following errors (132) during the restore: 

pg_restore: [archiver (db)] could not execute query: ERROR:  relation "xyz" already exists ...
pg_restore: [archiver (db)] could not execute query: ERROR:  multiple primary keys for ....
pg_restore: [archiver (db)] COPY failed: ERROR:  duplicate key value violates unique constraint ...

I tried restoring the 8.4 restore file to a new 8.4 database and there were no errors.  It almost looks like the schema
alreadyexisted when I went to do the restore, but I was careful to create the new database in the admin tool under the
correctserver.  I thought the admin tool created the new database in the data folder of the selected installation.  Any
ideason what might have happened?  Thanks.