As for the cannoli death, it could have been a brilliant touch, but Eli Wallach who was terrible throughout the movie couldn't even act dead very well.
You articulated it better than what I originally posted. The idea of poisoning Altobello was great, but I just thought it was implausible that he appeared to stop moving like a robot would when the batteries die.
If you haven't you might read my post above. A poison may act on the respitory system or the nervous syetem generally. in that case, Altobello might be gasping for breath at one point as his chest heaved. Those might also be spasms as portions of his system shut down. I didn't find it all that unusual.
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