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Do not put it in the product line!
I put it in the top right, below the date line.

in invoice.tpl

	<td style="font-size: 9pt; width: 35%;"> 
											<br /><span>{$carrier->name}</span>
											<br /><span>{foreach from=$order_invoice->getOrderPaymentCollection() item=payment}
											{$payment->payment_method} : {displayPrice currency=$payment->id_currency price=$payment->amount}
											{/foreach}
											</span>
											<span>	
											{foreach $order_details as $order_detail}{/foreach}
											<br />Not:{$order_detail.first_order_message} 
											<br />
											{if $order_detail.CustomerThread_message != $order_detail.first_order_message}
												Not:{$order_detail.CustomerThread_message}
											{/if} 
											</span>
	</td>