Like I said, Cameron didn't do it to show love between them, although it did convey it.. he did it to show a part of the ship that wouldn't be shown otherwise.

Had they been on the real ship, there was no possible way to get into the cargo hold they way they did. There wasn't a door between the boiler room they were in and the cargo room the way the were shown entering. Like I said also, Cameron KNEW that, but he did it despite that.