Solved
The cactus plant is visually broken
This is hardly noticeable but y'know how the cactus plant has those three little balls sticking out of his head? Yeah, normally those are connected by little black lines. It is like that in the origi...
I've also investigated this and actually the cactus in the original doesn't have the stems either. You just couldn't tell because of the low resolution (not even in the xbox version) so I don't think it's really a bug.
