FAQ for
Braindead (1992) More at IMDbPro »

"Braindead" is the actual and original title of the film and the title that is used everywhere except for in the United States. Due to conflicts with another film of the same name, the title "Dead Alive" was used instead.

That is merely the viewers opinion - but many people think so.

No - the creature is purely fictional and only inhabits "Skull Island" (which is also a fictional island first conceived in the original King Kong movie from 1933). According to the film's lore, the Sumatran Rat Monkey is the offspring of small tree monkeys being raped by giant plague rats, a combination which is actually quite impossible.

Technically, the zombies seem to stay "alive" until they are chopped and/or blended into nothing. In this sense, a zombie could be cut down so many times but will still survive until it is nothing but liquid. This can be proved by the organ-monster that attacks Lionel in the bathroom, attic and finally the hallway.

There has been no word of it.