Salieri's sweet tooth
I didn't realize until I watched the director's cut, but Salieri had a major sweet tooth. They added several scenes that included him pigging out, always on sweets. Not sure why I never noticed that in the original version...but dang, those 18th century sweets looked good! In the director's cut, there's a scene where Salieri shares a dessert with Mozart, cream cheese with sugar and rum, eaten like a pudding. Sounds hella good - will have to try that.
Proved by Dr. Maynard A. Quackstein's famed "Dolphin Resentment Study."