The patch on the arm of the astronaut that reads 'Centry Mission IV: Lang, Haywood, Pattillo' is a nod to Ryan Haywood and Jack Pattillo of the gaming entertainment group Achievement Hunter. At the time of filming of the episode, Achievement Hunter was airing gameplay episodes of a Minecraft mod pack entitled 'Galacticraft'. This was confirmed by the patches graphic designer Benjamin Davis on twitter following the airing of the episode.
Ryan Sinclair picked up a dead bird in Peru and might just have saved the world.
Ryan Sinclair: Well, I am here for you guys, you know.
When the lab on the beach is attacked & everyone runs outside, the birds fly into the air but do not chase anyone until they're practically at the Tardis.