Ok I've flagged up some Sound/music themes in this episode:
Walzer's stutter; Walzer's music and it's use in SETI; Vernon's radio interference; "I hope you like Motown".
Here are some visuals. First the newscasts: unlike episode 2 they seem to all be about the events occurring on the base. I an't see all of that headline, but I can read: C MILLER SHARPLY CRITICISED FOR INACTION
RCMP stands for Royal Canadian Mounted Police which makes sense. Sorry if you all knew that already.
Yuri's hospital label suggests episode 3 takes place on Sep 27th 2011, which would make Earthfall on the 24th. If there's ever a need for one I'll do a timeline.
That's all for now, will post some more easter eggs tomorrow, and feel free to request some in the comments.