• The Captain tells his German opponent that “War is hell”, using a quote first attributed to General William Tecumseh Sherman (1820-91), a celebrated Union Army officer during the American Civil War of 1861-65.
• The Captain is afforded a restorative tot of brandy from the TARDIS’ concealed drinks cabinet – the same cabinet that River Song pilfered a cheeky glass from in 2015’s The Husbands of River Song. The cabinet has been there all along, also hiding behind a roundel in the First Doctor’s TARDIS.