Be lazy, stand on the shoulders of others. List::Compare does all that and more. (The code below has been mildly tested.)

#!/usr/bin/perl

use strict;
use warnings;
use diagnostics;

use List::Compare;

my @List1 = qw(education production results);
my @List2 = qw(education joe bob carl production steve results test);

my @OutList1 = @List1;  #Part I is done...

my $lc = List::Compare->new(\@List1, \@List2);


# Get those items which appear (at least once) only in the second list
+.
my @OutList2 = $lc->get_complement;

my $n;
foreach (@OutList2) {print $n++.": $_\n"};
[download]

Output:

0: bob
1: carl
2: joe
3: steve
4: test
[download]

Cheers,

Brent