If you look at the number on the door in series one of Friends you will notice, the girls apartment is number 5. But how come in series 2 onwards the door says number 20? How did this happen? I thought they lived in the same apartment?
I saw on a commentary that they changed the apartment number because whenever the camara zooms in on the apartment from the outside, it's always going towards the top of the building, so they changed the number to a higher level.