My impression is that CTU got moved to NY from LA and the main entrance is located across the river from the UN. I think we are seeing the UN building in the background when Dana is outside with the Ex.
Renee was undercover for the FBI with the Russian mob 6 years ago. Then she came out of cover, and had her day with Jack 2-3 years ago. Then she had issues and was fired/let go after her experiences with Jack.
She seems to have issues similar to what Jack had back in seasons 2/3. She does not seem to care if she lives or dies. I think Jack senses this in her. It is odd to see Jack as the voice of reason. Cutting off a hand with a grinder is something he would have done a few years ago. Now he is the one who is appaled.
I was even able to tolerate Kim this year. And Jack seemed happy. That does not bode well.
How many years have passed in Jack's world? Only 8 have passed in our world, but it seems like 1-1/2 to 3 years is common and that would mean at least 12 -18 years have passed for Jack. There have been what, 4 Presidents? Even if some have died in office or only done a few years, Jack has to be getting old.
This is almost the exact opposite problem other shows have, where the actors are too old to play the character. Keifer is almost too young to play Jack anymore.