In the scene where Adam, Russell and Jeff are discussing Adam's ability to save money. He orders a bowl of soup, when the waitress brings the bowl it's soup. They pan away and when they pan back, it's now a bowl of fruit.
When Audrey announces the available apartment, she refers to the death of the old lady in 9A. When she goes to recommend Jenn and Adam, she specifies that they live in apartment 9A.