That's not what you should have done.
First thing first, mpeg2source doesn't load audio, so killaudio is useless there. Also, orphen isn't an old source (like, it's not from the 70s or early 80s), so using tweak is strongly discouraged.
For starters, do this
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mpeg2source(source of orphen clip)
TFM(pp=0)
Go around the source, see if there are
obvious interlacing leftovers (not just small combs).
If there are, your source is interlaced, if not it's telecined. It is also possible that your source is hybrid, which means that it mixes telecined and interlaced footage.
Hybrid in late 90s/early 00s tends to happen with CG (CG was generally done interlaced while anime was telecined), so that would be something to look out for.
Either way, I really doubt you have an interlaced or even hybrid source (to the best of my memory, orphen didn't have any massive CG usage), so at this point, if that tfm line pretty much fixed it, you should then change your script to this:
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mpeg2source(source of orphen clip)
tfm(mode=1,pp=5,slow=2,micmatching=2,clip2=tdeint(mode=2,type=3))
tdecimate()
Crop(8,0,-8,-0)
Spline36Resize(640,480)
And you'll have your progressive 23.976 clip. Do not use assumefps here, it is not needed.
However, if your source is interlaced, then:
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mpeg2source(source of orphen clip)
tdeint(mode=2,type=3)
Crop(8,0,-8,-0)
Spline36Resize(640,480)
Will give you a 29.97 progressive stream. Again, unless you have to edit your vid at 23.976, you won't need assumefps.
If you are so out of luck that it's hybrid, then make two scripts, one with the tfm and tdecimate as if it was telecined, and the other with the tdeint as if it was full interlaced.
Then, you use assumefps on one of the two scripts, either to bring the ivtc'd one to 29.97 or to bring the deinterlaced one to 23.976.
Finally, while you edit, you'd pick scenes from one or the other script depending on whether it was originally interlaced or telecined.
This is about as easy as it can be put down, I think...