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my %temp_hash;
while (my $ref = $sth->fetchrow_hashref) {
...
     my $title = $ref->{title};
    push @{$temp_hash{$season}}, { title => $title };
}

my $appearances = [ map { +{ season => $_ , eps => $temp_hash{$_} } } 
                       sort keys %temp_hash ];