Like many of the mini-episodes, this is slight but fun. You get to see Amy and The Doctor at a very formative point in their relationship just before The Beast Below. You get some cheeky, very Steven Moffaty lines making fun of DW, specifically why the TARDIS, this incredibly powerful machine, chooses to look like a 1960s police box. These fan in jokes would probably feel a bit crow-barred in, in an actual episode sit nicely here in a short scene that’s made for the fans who have bought a box set. Inoffensive, non-essential, very fun.