The Magician's Apprentice (Doctor Who) episode is a blue-and-silver model as first seen in 1963. Clara, upon deducing the Doctor's location and intent, says "Do not go gentle into that good night", the first line of the titular poem by Dylan Thomas. When the Doctor spies Clara and Missy, he plays the opening notes to Roy Orbison's "Oh, Pretty Woman". The Doctor's playing electric guitar and teaching medieval people the term "dude" echoes the movies "Bill & Ted's Excellent Adventure" and "Bill & Ted's Bogus Journey", films featuring two rocker teens who travel back in time – in a telephone call box – and teach
Gentle Giant "I hated making (that) last record, I hated being involved with it." In 2005, Derek Shulman reflected ""Civilian" was done with less passion than some of the other albums. As it turns out we as a band were just not good at being rock or pop stars. We would have loved to be as popular as a Genesis or Rush or Yes. In hindsight, I sometimes think that Gentle Giant was wrongfully put into the progressive rock category. Much of what we did was very clever, but we certainly didn't do these long complex tunes like Yes or Genesis did."