 TV editing was very difficult in the 1960s, and so (in common with  most other British TV drama at the time) many early episodes of  "Doctor Who" were recorded "as live". If the actors fluffed their  lines, the others had to cover for him/her. There are several  obvious instances of this in the series, such as in "The Web Planet"  where actor William Hartnell (qv) forgot his lines, leading to  co