About doors :
The first Frozen is following by doors
1. The castle's gates
This is the represent of Elsa and Anna being locked from the outside world
2. Elsa's room door
This represents Elsa locking herself from Anna , keeping each other a distance
3. Love is an open door
In this song the first line is " All my life has been a series of doors in my face" and Anna closes the door , this represents Anna keeping outsiders away from hers and Hans' personal time
4. Ice palace gates
When Elsa sings "the cold never bother me anyway" she shuts the door with her magic , this is the represent of her staying away from people outside
5. Library door
After Anna got a frozen heart , she wanted Hans' true love kiss , but then he told her that this was his plot , then he shut the door and locked it. This one is Hans locking her up to let her die.
6. The prison door
After Hans' plot was discovered by everyone he was thrown in to the prison on the boat was locked, this means that he is a criminal now and is dangerous
Tell me if I missed out any, or got anything wrong