Trivia: Dr. Horrible's Sing-Along Blog

  • Actor Allusion:
  • The Cameo / Production Posse: Drew Goddard at the end of Dr. Horrible's Sing-Along Blog as Bad Horse member "Fake Thomas Jefferson". He's written for both Buffy and Angel and directed The Cabin in the Woods.
    • The newsreaders in Episode III were played by David Fury and Marti Noxon, also from the Evil League of Evil, "Professor Normal" is played by Doug Petrie. All Buffy writers also.
  • Development Hell: The sequel, which is possibly delayed to 2015 due to Joss Whedon's commitments to the Marvel Cinematic Universe.
  • Jossed (quite literally): In the commentary, the cast mentions Dr. Horrible's overlarge armchair just happened to be in the house. The entire house just happened to be there, no set dressing required.
  • Hey, It's That Guy!: Hey it's Howard! And he's talking about Penny!
    • During the shots when the fan club is sitting in the audience you'll notice the fourth seat is occupied by a woman with sunglasses and a black wig whose nose looks just like Sarah Michelle Gellar's.. because that's exactly who it is. (Confirmed in the DVD Commentary)
  • Mean Character, Nice Actor: Both Nathan Fillion and Neil Patrick Harris qualify (albeit to a lesser extent with NPH regarding the "mean" part), as the former plays a Jerk Jock Nominal Hero and the latter plays a supervillain.
  • Name's the Same
  • No Export for You: In some places outside America. Good thing the DVD isn't region-locked.
  • Playing Against Type: Nathan Fillion as Captain Hammer.
  • Recycled Script: There was an episode of Angel about a shy scientist who liked to sing and was in love with a red-head. He built a machine that could stop time to solve his relationship problems.
    • Angel also had a plot in Season 5, in which the death of a character was used to get into an evil organization. Angel pretended to be involved in his friend Fred's death and really murdered another to infiltrate the Circle of The Black Thorn and Dr. Horrible's involvement in Penny's death filled the qualification to enter The Evil League of Evil.
  • Viral Marketing: The word spread about Dr. Horrible by word of mouth and word-of-internet. So fast and so far that the server was not prepared for the load and went down.