I was watching ep. 10 again (B-12), because... well, because I can't help myself, and I saw a so-called "movie-mistake". When Danny gets the note from Matt saying 5 people are dead in Grosse Pointe, he gets out of the chair, walks over to the and looks up at Matt who's standing on the balcony. Danny is holding the note out in his left hand, indicating to Matt that he's read the message. Then he makes a "cut" gesture with his right hand.
When they're showing the same scene half an hour into the episode, Danny is indicating to Matt that he's got the message by holding the note out in his right hand, before moving it to his left hand and making the "cut" gesture with his right.