some things i don't get...please help

Rating: 8/10 (8 February 2007)

to start off i haven't read the book so those who have probably have the answer to my question...
1.in the movie when jack is locked in the freezer room by wendy how does he get out?
2. was he the first caretaker then how could he be there after he had died?
3. some people interpreted that he was the 1st care taker so how come the people that were killed were a wife and 2 daughters and he had a wife and a son?
4.finnaly who were those people (one in a bear suit giving the other a blowjob)?