 The episode also saw the first appearance of the black and yellow grid structure of the empty holodeck . However , the interface unit used by Yar , which resembled a corded phone , was not seen again , with crew members using vocal commands to program the holodeck in future episodes . Captain Picard showed pride in his French heritage in this episode . This character quirk was only repeated in the following episode " The Last Outpost " before being removed from the character . 
