As Jack and Doyle are following Fayed after Fayed's staged getaway, if you look out the window behind Jack it's daylight for a few seconds and then quickly changes to night.
Wayne: (to the Ambassador) I am fully aware of how your country treats political prisoners so don't you dare speak to me of barbarism.
Fayed: (snickers) Do you honestly believe you can manipulate me by playing on my vanity? I serve the will of God!
Doyle: No, you don't. And if you don't believe me, ask him when you meet him. (draws gun to Fayed's head)
Audrey: Jack are you there? Can you hear me? Help me Jack. Please help me.
Cheng: Hello Mr. Bauer. Yes, Miss Raines is alive. If you wish for her to remain that way, you will call me back in 10 minutes at 310-597-3781 on a secure line. If you make any attempt to find our location, she dies.
Wayne: Ambassador. Your government has known about this man for quite some time haven't they?
Ambassador: Mr. President, this development has come as a shock...
Wayne: (slams fist) Stop lying to me! That missile will hit in less than two minutes, Mr. Ambassador, so please don't try my patience again.
Ambassador: You must understand the fragile political climate of my country. General Habib is a high ranking military commander.
Wayne: I really hope protecting this man was worth pushing us to the brink of World War Three. (pauses and looks at Lennox)
The missile will be aborted Mr. Ambassador.
Ambassador: Mr. President, my government has alerted me of the nuclear weapon currently headed toward my country.
Wayne: Yes, that's correct Mr. Ambassador we've made good on our threat.
Ambassador: For God's sake, I implore you to stop it.
Wayne: On what grounds?
Ambassador: We have uncovered new information regarding your situation.
Wayne: I'm listening.
Jack: (prepping Fayed for transport to CTU) Now we're going to have some fun.
Doyle: (looking around at the bloodied bodies of terrorists Jack single-handedly dispatched) Damn, Jack!
Jack: (about to kill Fayed) Say hello to your brother.
Fayed: Are you enjoying yourself, Bauer? As much as you enjoyed butchering my little brother?
Jack: (torturing Fayed) Your brother was responsible for the death of dozens of innocent lives. Now you're responsible for thousands. Trust me, I haven't begun to enjoy myself yet.
The episode won an Emmy Award for Outstanding Sound Editing for a Series.
Regina King (Sandra) is taken out of the main cast.
Kim Raver is uncredited in this episode, presumably to keep her appearance a surprise.
The fan phone makes another appearance, this time as the phone number Cheng gives to Jack.
Jack: Say hello to your brother!
Most likely taken from the movie Die Hard With A Vengeance when John McClane (Bruce Willis) aims his weapon at a nearby neon light to take down a helicopter carrying antagonist Simon Gruber (Jeremy Irons) and McClane says "Say hello to your brother" referring to the antagonist in the first Die Hard movie, Hans Gruber, (Alan Rickman, Simon's brother) also killed by McClane.
Also, when Jack hangs Fayed, it is very similar to the time John McClane hangs Karl with a chain in the first Die Hard movie.