Revealing mistake: During "A Man's Gotta Do", when Captain Hammer kneels down and crushes the gizmo on top of the van, you can briefly catch a glimpse of a black safety cable next to his knee.
Dr. Horrible's Sing-Along Blog (2008)
1 mistake in show generally
Starring: Neil Patrick Harris, Nathan Fillion, Simon Helberg, Felicia Day
Dr. Horrible: I don't have time for a grudge match with every poser in a parka.
Trivia: Was originally meant to be shot entirely with web-cams, with the characters reflecting on the events through dialog in video-blogs. However, after the story grew bigger during the writing process, it was ultimately decided that it would be filmed like a more traditional film or series, and the video-blogs became more of an occasional recurring motif than a main focus.