And in most cases, time compressed cartoons have the audio pitch a tad higher, typically if it's a PAL transfer from an NTSC video. This is due to NTSC video running at 29.97 frames per second, but with PAL it's 25.
I've often taken copies of my time-compressed cartoons and slowed them down to 95-96 percent, and usually the results are good, like when I did my updated version of "Fiesta Fiasco" a while back:
http://www.youtube.com/watch?v=r5Iz5r5XcOc