Doctor Who

The original, untransmitted pilot from September 1963 was originally thought lost, but survived by chance on being rediscovered in a mislabelled film can. It was eventually shown on BBC2 in a 1991 Lime Grove studios tribute.

Peri Brown is American, but often pronounces words in Nicola Bryant's English accent.

The tradition of showing The Doctor's face in the opening titles was not introduced until Patrick Troughton's tenure with the program was under way. During Jon Pertwee's era, the producers experimented with changing the opening credits and music. One of the rejected opening credits was accidentally included on some prints of the story "Carnival of Monsters" that were broadcast overseas.

The original videotape prints of 1960s-era episodes no longer exist. As a result, all later broadcasts of these episodes (PBS, Sci-Fi Channel, BBC) have used film and kinescope transfers. When these early episodes began to be issued on DVD in the early-2000s, computer technology was used to restore the video look to these episodes. In addition, other restorations and corrections to the original broadcasts were made. (For example, the sound mix is altered to remove background noise and accidental sounds like coughs in the studio, in one episode a boom shadow was digitially removed). These restorations are particularly apparent in the box sets Lost in Time and The Beginning which compile surviving episodes from the early years of the series.