No, that wasn't it, but you put me on the right path! You're correct that I had the wrong number of hashrefs, but changing the above line to my @data;, the output is correct. Thank you :)

Temp: '333 aaa' added to row 0  at test.pl line 39.
Temp: '444 bbb' added to row 1  at test.pl line 39.
Temp: '555 ccc' added to row 2  at test.pl line 39.
$VAR1 = {
          'data' => [
                      {
                        'foo' => '333',
                        'bar' => 'aaa'
                      },
                      {
                        'foo' => '444',
                        'bar' => 'bbb'
                      },
                      {
                        'foo' => '555',
                        'bar' => 'ccc'
                      }
                    ],
          'headers' => [
                         'foo',
                         'bar'
                       ]
        };
[download]

Now, does anyone care to tell my po' self why this worked? I feel unusually dense today.

Update: Apparently, using the 'x' operator to populate an array with references will populate it with the same reference for every element, which apparently is the problem. My intent in populating the array with hashrefs was to ensure strong type checking:

my @foo = ([]);
@{$foo[0]}{'one'}='uno'
[download]

The above code fails because you can't coerce an array into a hash.

Cheers,
Ovid

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