First of all: I've tried a lot of N64 emulators but they all have the very same problem when emulating this rom (even tried with a lot of different graphics plugins). It seems like an emulation/graphics_p issue, not just a random "can't get this rom to work".
You can reproduce "the problem" with just 1 minute of gameplay.
1: Emulate Body Harvest
2: As you start playing, keep walking forward untill you find a house next to a drawbridge and a green truck, then try to go up the stairs the house has on one of its sides and see what happens.
Unfortunately you can't even get past the first level because of this lol.
If a dev reads this, I'll be very happy to read his oppinion on this.
Cheers,
A