Goof: The actress who plays young Sydney has blue eyes while Jennifer Garner has brown.
After APO was destroyed in the previous episode, the gang are now working from the old garage that was once Sydney and Vaughn's main meet-up spot!
Number 47: The transaction number of the purchase of the missiles by Sloane is: 8447.
Number 47: The missiles override code is: 3-9-8-alpha-4-tango-6-4-7.
Goof: When Vaughn confronts Sark in the control room and fires at Sark's knee, the gun's sound is of a silenced gun, yet Vaughn's gun has no silencer.
When Dixon shows Sydney and Vaughn the photo of Sark during the final scene, the page behind Sark's photo has the scene's script on it.
When Sydney was talking to her shot father before he urged her to leave, she had a booger coming from one nostril, shots following, the booger altered from being on the other nostril and not being there at all.
When Sydney is moving Jack's hand to apply pressure on his wound, her hands are covered in blood. In the two times we see her hands they are clean. Then they are bloody again.
The first city name to appear in this episode is Sydney. So we see Sydney in Sydney for the first time the last time Alias aired (the series finale was aired as 2 episodes together).
Before shooting the ground Sydney was standing on to cause the cave in at Mt Subasio, Sloane said he knew of the pain she felt having lost Danny and Vaughn.
Despite it's name, The Mount Subasio is not a mountain but a little hill height only 4.232 feets.
It's hard to find snow and glaciers !!!
Goof: You can clearly see Thom's scar in his right eyebrow missing in the scene where he kisses Rachel in her house.
Once again, if you remove a full ammunition cartridge from a gun and hand it to someone, the weight will give away that the gun is empty.
In the scene when the fake Sydney extracts the second half of the computer chip from Vaughn's chest in Nepal, we see Sydney digging around with tongs under his skin, find the chip, and slowly draw it from the wound to show the audience. We then see blood across the top of the chip but none on the bottom when Sydney turns it over and none on the tongs themselves.
Also, Vaughn claimed not to know the chip was in his body for the last 30+ years. With as many times as we've seen him injured and hospitalized over the course of the show, how would repeated body scans, MRI's, x-rays, etc. miss a foreign object planted so close to the skin's surface in such an accessible part of the body?
In this episode, Sloane asks Peyton to retrieve a book from Geneva.
However, when Peyton arrives in the city to fetch the book, the caption and city shot shows Zurich.
When the 47 paper was burning in the fireplace, you can see the glowing < o > eye symbol.
Two former series regulars die in this episode. On the episode of JJ Abrams' other show Lost which aired the exact same night, two regulars were killed off (or at least received fatal wounds) as well.
Sloane has two different spectacles in this episode with the same shape but different color. In the beginning, it has a yellow frame, later it has a green one.
Number 47: The Rambaldi manuscript page Anna is after is Page 47 (which, by the way, is also the title of season 1 episode 15).
Number 47: The room Will is taken from is room 147. No. 47.