According to creator 'Jeffrey Abrams', the background of the words "Alias" in the opening credits come from home movies of his family. Also in the opening credits, the "Rambaldi" symbol is visible for a split-second.
Beginning in the second season, episodes that are running too long have no opening theme. The credits are played over the episode and the only title logo you see is the black screen with the words ALIAS that is seen at the end of every episode.
The first few episodes of the first season do not have the "My name is Sydney Bristow..." introductory monologue; neither does the later season 1 episode "Q & A." By midway through the second season, the opening narration (which by that point was no longer recited by 'Jennifer Garner') was replaced altogether with a recap of previous episodes.