# After this line from snippet 1...
my %testHash = ( \@multiKey1 => \@stuff1, \@multiKey2 => \@stuff2, \@multiKey3 => \@stuff3);

# ... add this:
use Data::Dumper;
print Dumper \%testHash;

# And run the snippet.

__END__
Output:

$VAR1 = {
          'ARRAY(0x98a9b4)' => [
                                 '6',
                                 '7'
                               ],
...
...

##</code><code>##

# Change this line from your first snippet...
# my %testHash = ( \@multiKey1 => \@stuff1, \@multiKey2 => \@stuff2, \@multiKey3 => \@stuff3);

# into this:
my %testHash = ( \@multiKey1,  \@stuff1, \@multiKey2, \@stuff2, \@multiKey3, \@stuff3);

# ... and still use this:
use Data::Dumper;
print Dumper \%testHash;

# And run the code.

##</code><code>##

my %testHash = ( \@multiKey1,  \@stuff1, \@multiKey2, \@stuff2, \@multiKey3, \@stuff3);

@testHashKeys = keys %testHash;
@testHashValues = values %testHash;
$tmp = @testHashKeys;
foreach (@testHashKeys){
        print ref($_), ": ";
        print "deref bla = @$_ = $_\n";
}
foreach (@testHashValues){
        print ref($_), ": ";
        print "deref bla = @$_ = $_\n";
}

__END__
Output:

: deref bla =  = ARRAY(0x98a9b4)
: deref bla =  = ARRAY(0x98a914)
: deref bla =  = ARRAY(0x98a844)
ARRAY: deref bla = 6 7 = ARRAY(0x98aa04)
ARRAY: deref bla = 4 5 = ARRAY(0x98a964)
ARRAY: deref bla = 1 2 3 = ARRAY(0x3e8d8c)