My recent Do the internal inconsistencies of Futurama ever cause it to suffer? question has been called subjective. How can I fix it, if it indeed needs fixing?
It certainly doesn't look subjective to me. Your question is asking two distinct, independently verifiable things:
- Has the Futurama fandom ever reacted negatively to one of its many consistency hiccups?
- Was there ever a retcon of a consistency error with the purpose of placating an angry fanbase?
These two basic questions seem to me to be fairly straightforward yes/no questions. Either there were problems or there weren't, either they led to retcons or they didn't.
You're not appealing to individual opinions here, but to a community's reaction, which is something that can be objectively measured.