Character mistake: When Aria is taking her Maths Algebra test, we get a short glimpse of her paper at the start of the scene. Question 4 spells the word 'population' as 'popopulation' the second time it is written in the question.
Pretty Little Liars (2010)
1 character mistake in season 5
Starring: Lucy Hale, Ashley Benson, Sasha Pieterse, Shay Mitchell
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.
The Homecoming Hangover - S1-E7
Trivia: The substitute teacher filling in for Mr. Fitz's class is played by Sara Shepard, the author of the Pretty Little Liars novels.