That was fantastic, what a find! Love the way the guy combined modern 3D animation with the old-school sensibility. Too bad his Kickstarter project to fun the creation of a full episode was not successful. Which is kind of ironic, since the original show was cancelled due to high production costs, despite huge popularity.
Hanna-Barbera developed the technique of limited animation in order to cut corners and meet the tighter scheduling and budgetary demands of television. As opposed to full animation, this means that characters generally move from side to side with a sliding background behind them and are drawn mostly in static form, with only the moving parts (like running legs, shifting eyes, or talking mouths) being re-drawn from frame to frame on a separate layer.
This was particularly true of Jonny Quest. The series' visual style was unusual for its time, combining a fairly realistic depiction of human figures and objects with the limited animation technique .... The series made heavy use of rich music scores, off-screen impacts with sound effects, reaction shots, cycling animations, cutaways, scene-to-scene dissolves, and abbreviated dialogue to move the story forward, without requiring extensive original animation of figures. For example, objects would often reverse direction off-screen, eliminating the need to show the turn, or a running character would enter the frame sliding to a stop, allowing a single drawn figure to be used.