» A number one hit from 1981 is heard.
» The Doctor likes a particular comic.
» The episode has shades of ‘Father’s Day’ and ‘Gridlock’.
» Nice to see a certain relation get a mention.
» You’ll see more aliens than you ever have in one single episode of Doctor Who.
» Clara makes a reference to Jenna-Louise Coleman.
» The Doctor has a go at singing.
» Someone’s been watching Indiana Jones and the Temple of Doom and Blade Runner.
» The Doctor wants to eat scones in the Lake District.
» Clara doesn’t want to be competition.