Joughin's own testimony reveals that he was assigned as 'captain' of boat 10, but that far from needing to give up his place for a woman and child the crew had difficulty finding women willing to enter the boat and eventually they brought some up from A Deck 'by force'. Before the partially filled boat was lowered Joughin stood by awaiting the order to board but two sailors and a steward were ordered in and he was not called. He seemed to accept that without complaint - a baker doesn't question the orders of the Chief Officer. And he certainly didn't know the names of the sailors. So it seems that the screenwriter for ANTR put two and two together and came up with five.
If Joughin was right that he had been assigned as the boat's commander, that would seem to be an odd choice. Wilde put AB Edward Buley in charge, which makes a lot more sense.