The problem is that you have to store multiple values into an anonymous array ref, and hash slices implicitly loop on lists, not a scalar that points to an anonymous array ref. How about the old fashioned way instead?

use strict;
use warnings;
use Data::Dumper;

my %hash;
my @array1 = qw"some_unique_key1 some_unique_key2 some_unique_key3";
my @array2 = qw"meta_data_1 metadata_2 metadat_3";
my @array3 = qw"submitted_date1 submitted_date2 submitted_date3";

for (0 .. $#array1) {
    $hash{ $array1[$_] } = [ $array2[$_], $array3[$_] ];
}

print Dumper \%hash;
[download]

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)