In the future, nobody has cell phones. Except for the people with computer uplinks--- but they get poor coverage. The common folk have to content themselves with long cords on their home phones.
"MacLean Stevens kept his emergency phone on a fifty-food cord rooted in the central hall. That way he could move around the house while tied up on the phone. In particular, he could reach the coffee cup and the liquor cabinet, and when he got calls on that phone he often needed to."
The Los Angeles of the future has white people and black people but apparently no other ethnicities.
Rather than focusing on knowledge industries, arcology residents of the future will engage in a variety of manufacturing (both local and telepresence). Business networking events will be entirely male-dominated; female executives will be the exception.
Also, affluent residents of high-tech arcologies will no longer see the need for domestic staff.