Part of the score for this episode includes Latin lyrics which translate to, "All of this has happened before / All of this will happen again," and, "So say we all."
The interior location of the Opera House is the Orpheum Theater in Vancouver, BC. This is a popular filming location. The location was used in an episode of the X-Files, (Season one, "Lazarus") among other television series and films.
Went through a number of changes according to the Podcast commentary. Some of these early differences include: 1. Part One was to conclude with the Raptor crashing and Part Two would end with Starbuck stealing the Raider to finish the finale with a season-ending cliffhanger. This was changed when the original pacing wasn't working. 2. Originally, the ruins on Kobol were supposed to be a huge temple that was mirrored on Caprica. This was abandoned due to cost constraints. 3. What Baltar and Number Six experienced inside the ruins on Kobol went through a number of changes. Originally, Ron D. Moore proposed to the other writers that there was supposed to be a bright corridor of light. In a later version, there was to be complete darkness punctuated with music from a song recognizable by both the audience and the two explorers. Then, Dirk Benedict (Starbuck from the original "Battlestar Galactica" (1978)) was supposed appear and say something like, "Hi. I'm God." followed by TO BE CONTINUED... However, the other writers quickly disparaged the idea as implausible, and Ron D. Moore reluctantly agreed. 4. One concept that the writers liked, but were forced to abandon was the idea that the interior room of the ruins was to be located in "otherspace" or in a different spatial or dimensional location.
There is a discrepancy between the number of survivors written on the whiteboard in Laura's ship's "office". At 8:25 into the episode, it reveals the number of survivors as 47,887. However, at 14:56, it reveals the number of survivors as 47,987. But then, through the rest of the finale episode, it is clearly back to 47,887 at 15:10 and 22:16 onward. This must have been either a technical/editing error or perhaps an accidentally erased part of the board during filming. (Timestamped scenes are according to the US Blu-ray boxset versions of this episode.)