At the end of the episode Sheldon Hawkes announces that he has a new studio apartment to which Mac Taylor replies "Does that mean I get my couch back?" but in a previous episode, when finding out Hawkes was essentially homeless Mac threw him some keys and said "I have a spare room".
The sun charts and the photo from two years earlier both show sunrise as 6.05 am, yet in New York on 5 December, sunrise is more like 7.05 am.
Although the story takes place in December it doesn't look like December on the streets (e.g. no Christmas decorations etc.).