Well, whether it's technically plagiarism depends who was being copied from and whether the old animator was in the credits for the new movie (this is different from copyright violation, where it's sufficient to say the copyright was owned by Disney).
Your examples are poor, though, since it's a different situation when referring to a novel creative work: Do you start from a blank canvas when you paint a painting? Do you start from page one when you write a novel? Not that there would necessarily be anything wrong (morally or legally) with tracing old paintings or reusing old chapters, but people would still look askance at the artist or author who made that their MO.
'Course, it's not surprising to see such corner-cutting from makers of commercial art, and Disney is certainly not the only example of "self-plagiarism". And there's something funny about that (the humor is either the cheekiness of Disney trying to pass off something old as something new, or the surprise of the viewer that two seemingly unrelated movies have almost exactly the same scenes).
Still, I'd guess that there are plenty of animation studios that don't rely so heavily on tracing... although maybe you could go through, say, Studio Ghibli's oeuvre and make a similar compilation. (If that's possible, no doubt that one would also be amusing to watch.)
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Your examples are poor, though, since it's a different situation when referring to a novel creative work: Do you start from a blank canvas when you paint a painting? Do you start from page one when you write a novel? Not that there would necessarily be anything wrong (morally or legally) with tracing old paintings or reusing old chapters, but people would still look askance at the artist or author who made that their MO.
'Course, it's not surprising to see such corner-cutting from makers of commercial art, and Disney is certainly not the only example of "self-plagiarism". And there's something funny about that (the humor is either the cheekiness of Disney trying to pass off something old as something new, or the surprise of the viewer that two seemingly unrelated movies have almost exactly the same scenes).
Still, I'd guess that there are plenty of animation studios that don't rely so heavily on tracing... although maybe you could go through, say, Studio Ghibli's oeuvre and make a similar compilation. (If that's possible, no doubt that one would also be amusing to watch.)