Alias

When Jack is talking to Irina via instant messenger, he types his message, presses send, and the message displays. However, when Irina types her message, it comes up a word at a time. The messenger they are using must use one method or the other, not both.

Goof: When the plane starts to dive, because the pilots are dead, Sydney and Vaughn start to move up an incline. This means they are moving to the tail of the plane, not the cockpit.

Number 47: Sydney and Vaughn's plane's registration number is N9748C.

There are three Derevko sisters: Irina, Katya and Elena.

When Vaughn sprays the area around the crashed plane with gasoline and then throws a flare to light the gasoline, you can see through the smoke of the flare that he threw it over the plane. After the flare lands, you can very clearly see the pyrotechnics igniting the gasoline in the foreground. Therefore the flare itself may have not lit the gasoline but rather there could have been sparks from the flare which ignited the area in the foreground.

The pictures from the city of Zurich in this episode (and in 3x06, 3x13) are actually showing a hungarian square from Budapest, Hungary, called Astoria. By the way this square (with the house that has the big advertisement on the top) was the one where Brad Pitt and Robert Redford were talking in the movie Spy Game, in that movie Budapest was used instead of Berlin.

Jack and Irina were married for ten years, as established in several episodes. But Katya talks about how Jack was married to Irina for five years and never figured out she was a spy.