Tom Zarek is played by Richard Hatch, who played captain Apollo in the original Battlestar Galactica (1978).
The character of Cally was supposed to be killed off in the original drafts of this script, but David Eick decided he wanted her to fight back during the rape scene rather than be killed off. Cally later became an important recurring character in the series.
47,958 survivors as listed at 26:03 on Laura Roslin's white board. The number is obscured but the count doesn't change during subsequent shows.
The Astral Queen is an identical ship to the prison barge that was seen in the original series where Baltar was held prisoner. That ship was simply known as the prison barge.
When Boomer and Helo are walking through Cylon controlled Caprica, they walk into and through Library Square in Vancouver, BC, Canada.