Carlos Bernard (Tony) does not appear in this episode.
After Jack enters Christopher's office, he's tasered. Soon after, he's already waking up. If this is a real-time show, how did Christopher drag Jack to the desk, grab the gun, wake up Jack in only one second?
While arguing with Audrey, Lynn says "My people are not going to chase that white elephant". He means "wild goose", as a white elephant is an expensive liability, not a false trail.
After the motorcade attack fails, Novick says, "We need to prepare ourselves for the terrorists' retaliation." However, the closed-captioning says "...Bierko's retaliation" which is an error since since at this point they don't know the name of the head terrorist.
A secret service agent walks into Logan's office and hands Mike a phone while the two men are talking about President Suvarov's imminent death. Shouldn't he have been just a little bit more suspicious?
Omicron's building is obviously not very secure. Despite Jack needing to check in with security, the guard never gave Jack a badge, or screened Jack into the building. It appears that he walked straight through.
McGill: (referring to Suvarov) My people are not going to chase that white elephant.
Henderson: So who is the honcho over at CTU now?
Jack: Bill Buchanan.
Henderson: Buchanan? What a stiff! No wonder why everything is going to hell over there. You guys keep getting rid of everyone who can do their job.
Henderson: The one thing that hurts me is that you didn't believe me.
Jack: You made it impossible to believe you.
Curtis: If you try to carry out that command, I will draw my weapon.
Henderson: (to Jack) Just for the record, I never believed you were dead.
Jane Espenson, Audrey's alias when calling Henderson's secretary, is a real person, best known for her writing on the TV series Buffy the Vampire Slayer. David Fury, who is a Co-Executive Producer on 24, also worked with Espenson on Buffy and slipped her name in as an in-joke.
Beginning with this episode, Sean Astin is credited as Special Guest Star.
Throughout Season 5, Peter Weller receives the "and" credit.
It is revealed that Jack implicated Henderson in an Internal Affairs investigation resulting in his resignation for taking bribes, a reference to Season 1 when Jack was harassed by Teddy Hanlin for implicating his partner Seth Campbell and 'two others' for bribe taking. Henderson was one of the other two.
Henderson makes reference to Nina Myers and George Mason, two main characters from Season 1 of the series.