During the 2013 Super Bowl rehearsal, the power cuts. The documentary uses a low-pass filter on audio. to catch the stage manager yelling, "She’s still singing in the dark. That’s a professional."
If you own a digital copy (MKV, MP4) that lacks captions, you need an (SubRip Text). This is a simple text file that syncs dialogue to timecodes.
For viewers requiring subtitles or closed captioning (CC), the documentary is widely available across multiple platforms with extensive language support.