Does it really ignore 2 and 3?
They say Angela has been locked up for twenty years, but she could have been placed in a mental hospital after the events of Part 3. Also, she had a sex change in between 1 and 2 yet they still refer to her as a man in this one. Either the sex change was a rumor, they didn't know about the sex change, or they're referring to the fact that she was born a man.
I enjoyed this one, but I love 2 and 3, so I like to think they're all canon. Also, I felt like there was some references to Part 2 here such as a character named T.C. and Weed's death was similar to that of the Shilt sisters.
"Cinema is everything to me. I live and breathe films -- I even eat them!"
- Lucio Fulci