Emma Coolidge: Emma discovers that she can produce a damaging shockwave with her synesthetic "siren's song," as evidenced when she accents the final note while playing the cello and in doing so creates a huge split in the wall in front of her.
In the scene where Peter and Emma are playing piano the music (colors) come from the keyboard. The keys of a piano are connected to hammers that hit the snares in the back of the piano. The music therefore should not be coming from the keyboard but out of the top of the piano.
Trivia: We learn Peter does not consciously control his powers as he accidentally takes Emma's power when he touches her sleeve.
In the scene where Peter and Angela are talking you can see the symbol made of pins on the door frame.
The song the children's choir was singing in the hospital is titled "Believe it or Not" and was the theme from The Greatest American Hero.
Samuel: This is my favorite part of the day. It's full of possibility. Before the inevitable monkey wrenches come looking for us. But more than anything... it's about being with all of you. I know grace is a supper thing, but every morning I thank Heaven and Earth for our family.
(referring to Sylar)
Madeline: Would you do me a favor and unlock these cuffs?
Lubbock: No. I don't make a habit of locking myself in with unrestrained lunatics.
Madeline: Then can you leave me your keys on the way out?
Australia: November 18, 2009 on 7TWO
UK: January 30, 2010 on BBC2
Latin America: February 9, 2010 on Universal Channel
Germany: September 22, 2010 on RTL II
Czech Republic: December 24, 2010 on Prima COOL
Finland: February 16, 2011 on Sub
Greg Grunberg does the "Previously on Heroes" voiceover but doesn't appear or is credited.