The 2 children who say "Bad Robot." in the Bad Robot logo are the children of the show's executive producer, J.J Abrams.

Jack Bristow's full name is Jonathan Donahue Bristow.

The initials "SD" of SD-6 stand for Section Disparue, which means "the section that doesn't exist."

During the title sequence, the creator J.J. Abrams' home movies are playing behind the Alias logo. The home movies are from a 4th July picnic.

Throughout the show, the number 47 appears many times. There are multiple room 47's (where Syd found the Circumference in season 1 and the room in her memories from season 3, among others.), there are 47 Rambaldi artifacts, and page 47 of the Rambaldi manuscript was the page that had Sydney's picture on it.

In episode 3-11, there is a shot of Sydney and Lazarey walking into a cave. When the camera pans upward, the Rambaldi sign is visible. Closer to the right side of the screen, 'Milo' is also spelled out in whitish cracks.

During the beginning credits, while 'ALIAS' is being spelled out, look closely. Shortly after the S appears the Rambaldi sign <0> flashes for one frame.

In 2002, series creator J.J. Abrams gave star Jennifer Garner a pink bicycle for her birthday. Being the first one on set, she would often greet the production crew by ringing the bells on the bike's handlebars.

Joey Slotnick (Haladaki) and Greg Grunberg (Weiss) previously worked together on Hollow Man.