One thing that bothers me

this is just my opinion, the apartments were side by side outside, so Suzy went to Gloria's apartment to use her phone and to hide, she would be seen by three men, maybe they would try to hurt Gloria too.

Gloria's parents, her mother was out partying and her father had left them for legal separation.

Well, panic makes you do funny things. But I think probably is that she knows no one is home - Gloria's mother and Shatner (the other neighbor) are both gone for the weekend, and she herself has sent Gloria away. If it were me, I'd automatically assume doors were locked. I'd probably try the other apartments only if I had run out of options in my immediate vicinity.

But, hey - movies all need suspension of belief, don't they?

I wondered the same thing -- and as much as Gloria was popping in and out I suspect the door wouldn't have been locked, any more than Suzy's was.

She could also possibly have escaped out of their windows, since it would be on the first floor and liable to have windows not facing the street.

Even if she could have just gotten inside, locked the door and called the police, it's not likely the hoods could have stopped her in time, and then they'd be hightailing it out of there before the cops arrived.

I was really hopimg that you would touch upon the thing that actually bothers me about this movie.....
It's the end.... I can understand Sam wanting Suzie to do things for herself. My big problem is at the end when she has been through so much......
Give me a break! If this man really loves this woman, WHY is this man just standing there and demanding that she comes to him?????
We get that he wanted her to do things his way. We get that he wanted her to be self sufficient. We got that.....
She has been through so much and he has to know that when there are dead bodies and she is hiding and crying behind a fridge door!
GO TO HER!!!!!
She has been through enough.

Fasten your seatbelts.... It's going to be a bumpy night!

All of these questions are great. The main problem with all of these questions is that they question the movie. The movie was a script that deviated from the play.
The play is one of the most AMAZING scripts ever written.

Frederick Knott was an amazing playwright. Purchase a copy, rent a copy, somehow get a copy and read it. All of your questions will be answered.

He wraps up things nicely.

Oh, at the end of the film, Sam knows Susy well enough to know that she would prefer to walk to him on her own. This shows that Susy is an independent woman.
That is what I get from the ending of the play as well...