1) go to the strip club , and wait for a girl to ask you : do you want me 2 dance for you ...
then follow her. let her do 2 dance's. the third dance she will call in a friend of her's ;-)
2)if you steal a car with people in it , then the driver should normaly pull you out ...
if he/she comes back , then just when he opens the door u gotta ride away
sometimes they will keep hanging at the car xD (normaly , but not always , also u need good timing)
3)get a helicopter. fly to hapiness island (liberty islang : with the statue ...)
get to the highest floor where there are still doors (under the feet of the statue)
JUMP OUT! (on the floor where i told you!) there are 4 doors
get into the one with the plaques : "no hidden content this way". climb up
there is THE HART of Liberty City!