I remember starting to watch this one a few years ago, I don't know if I fell asleep, blacked out, or blocked it out but I have no personal recollections to add to this one- if anyone else does, please feel free to chime in, or better, put it in the permanent record at DtDD:

https://www.doesthedogdie.com/media/40227

Someone is eaten
- Several people are eaten by a large carnivorous plant. -pedanther
Someone dies by suicide
- No Details Given -
Someone self harms
- No Details Given -
The ending is sad
- Somewhat? Some major characters wind up dead - although fewer than you might expect if you're only familiar with the later versions - but it's all played for laughs and the actual closing moment of the movie is paying off a running gag. -pedanther

(There was also a small bit of debate whether Audrey II eating people counts as cannibalism...)