When I was a kid, I would watch hours of Tom & Jerry every day (between TBS and the local stations, I could probably have spent 12 hours a day watching Tom & Jerry). I didn't know much about the history of animation, but I figured out a few "styles"... Early Hanna-Barbera, 50's Hanna-Barbera, Chuck Jones-style, 60's style, Filmation, and... the Gene Deitch ones.
I instinctively didn't like the Filmation ones, but the Gene Deitch vignettes... these are the things the nightmares of children are built upon.
I don't know how to properly convey how weird these things are in the pantheon of Tom & Jerry cartoons. Gene Deitch was a master animator, but of avant-garde subjects; his angular, flat style just doesn't work- it feels like you're watching a badly dubbed cartoon, rather than new-style animation. It actually felt like I was watching a cartoon done in a third-world country that "appropriated" the T&J characters- Stalinist cartoons, perhaps.
The sounds, too... Tom & Jerry always had creepy bits (who doesn't remember "Don't you believe it!" after Tom gets blown up by the atomic white mouse?) but the Deitch shorts... the sf/x all sound synthesized and strange. If Jerry is confused, what do you hear? Not a tiny voice going "Hmmm", but a wobbling-sheet-metal sound, as if it were being done in an echo chamber.
The over-all effect is the same feeling I get when watching Italian horror/sexploitation flicks, or Jorge Buttgereit's work (Nekromantik, Der Todesking)- this is *definitely* not what I should feel like when watching a Tom & Jerry cartoon...