Careful What U Wish 4 - S1-E14
Other mistake: During the scene after the fund raising dance when Lucas offers to take Hanna home, she calls him Ian when she says that she is going home with Emily and Spencer. Even if she says "I kind of promised them", the subtitles say Ian.
No Quarter - S1-E4
Other mistake: In this episode one of the characters is seen to be driving a VW Golf. The scene is set in Geneva Switzerland. However an American spec VW Golf is used. Also in backround shots, American vehicles not avalible in Europe are seen. Another scene shows the police race past in two Skoda Rapides. This car has not been made since the early 90's and it is highly unlikely that the Swiss Police would be using these cars still. The shot is an old video that appears to have been shot in an Eastern European country.
Other mistake: Duke is checking old copies of the Haven Herald around the time of Lucy (27 years ago). A headline on the one he's reading is about Lucy's disappearance. A moment later, he's reading a story about a meteor shower that occurs every 27 years; but the text we can see states that it just happened, and refers to dates in 2010 (having just happened, not '27 years from now'). This paper is supposed to be a 1983 edition. Also there is fake Latin 'filler text' printed in some columns.
Suggested correction: Lucy's disappearance is at the top of the newspaper and the hunter storm is at the bottom of the same page. Also, the paper predicts the next storm to occur. Just like how we know when to expect the next lunar eclipse or the next meteor shower, so I don't see how this is a mistake.
It's not a prediction of events to come, it's an article telling about the recent event, which states it was seen on the morning of the October 21, 2010. It even compares the 2010 shower to a previous shower that occurred in 2009. The mistake is valid.
Other mistake: In episode 5, while Sean is talking to Leila on his iPhone, it is obvious that there is no connection, because Home screen of iPhone is displaying on device. (00:14:20)
Other mistake: Raylan fires two shots into the above-ground pool, but it springs three leaks. Looking closely it does appear that Timothy Olyphant squeezed the trigger three times, but one blank must have misfired, and the three squibs went off regardless.