Ummm....
Johnny 5 employs a lot of practical design aspects in robotics. If I wanted to build a wheeled robot (with the funds of course), that type of tread would probably be what I would choose. The head design has been used in other robot designs, Johnny 5's is probably the most expressive out of all of them, but the gist of the design remains the same. For goodness sakes, in 1982 E.T. has that kind of head, what do you think the set engineers stuffed his head with?
The field of robotics has a tendency to take their designs from others. Last I checked, a popular amateur robot design closely resembles ASIMO. Gundam and Robotech robots designs appear all the time, Doesn't Nissan's new robot reek of classic Japanese robot anime design? Doubt they're paying royalties.
I admit, WALL·E's design may have been taken from J5, but that site you linked to makes a piss poor argument of it.