Really a lot of that stuff is very problematic in the real world.
The jet pack is essentially a small rocket, and could explode on a user's back, or could run out of fuel 50-100 feet up. That's not enough to use a parachute, but it's high enough to kill the user.
Flying car designers never thought of 3-D traffic jams and/or accidents until the 2000's, when a couple of movies explored those possibilities.
Dome homes would be real hothouses, and keeping the dome clean would be a real big problem. Who wants to live with a view that has scratches, dirt or water streaks and tracks, and oily grunge all over it?
Most of that futuristic stuff was nothing but sleek design exercises. Making them practical and affordable wasn't a consideration. Notice the rocket man fashions- they never happened either.