Other mistake: The URL seen on Siobhan's laptop (https://internet-search.comm7986/index.html) is obviously a fake URL.
Orphan Black (2013)
1 other mistake in season 5 - chronological order
Starring: Tatiana Maslany, Maria Doyle Kennedy, Jordan Gavaris, Kristian Bruun
Revealing mistake: After Krystal goes to the bathroom, Sarah's phone is not in call mode.