Revealing mistake: After Krystal goes to the bathroom, Sarah's phone is not in call mode.
Other mistake: The URL seen on Siobhan's laptop (https://internet-search.comm7986/index.html) is obviously a fake URL.
Revealing mistake: Not long into Sarah's phone call to Rachel telling her P.T. Westmorland's real age/name, Sarah's phone is not actually in call mode.
Continuity mistake: When Gracie is on the phone to Mark and reading Helena's diary, the diary has changed position on Helena's bed before Gracie touches it.
Continuity mistake: When Art kills Simon Frontenac, the barrel of his handgun is pulled back, indicating that the magazine is empty. When he checks Frontenac's pulse, the barrel is pulled forward again.
