I found some extra dialogue by trying to survive the Explosion Ending by using portals, and I have found no mention of it online. First you use the console to summon portals and then place the first one in the Escape corridor. Place the second in the Mnd Control room. Then start the Explosion ending timer and go through the second portal into the Escape corridor. Run to the end of the corridor and you will see that there is a wall blocking you off. The narrator then proceeds to say "Nope, Still on board with death"
The game is extremely clever and always is full of surprises. It will forever be my favourite video game.
P.S to learn how to use Portals watch this video from 57:31 - https://www.youtube.com/watch?v=zvRtJMUd71A