Knighttime - S3-E2
Other mistake: When Abby uses her phone to show Eric the pictures that Sven posted on Instagram, her phone states it is 11:26pm when you can see it is daylight after they walk back into Eric's room straight after. (00:05:00)
Wuffenloaf - S3-E1
Plot hole: When Abby and Eric return the night vision goggles, Abby asks if they should put them back exactly where they were and Eric says he didn't remember where they went but luckily he "took a picture" of how it looked before. How could this be possible if Abby purposely excluded him when she collected those goggles from Lisa?