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 Out, Damned Spot - chronological order
Starring: Lucy Hale, Ashley Benson, Sasha Pieterse, Shay Mitchell
Continuity mistake: On the video of Ian supposedly killing Alison, we see her arm fall to the ground with her "Alison" bracelet visible. But in a later scene where Emily watches Ian put his bag in the athletics room, we cut back to the video and Alison's arm suddenly has a sleeve covering up her bracelet. When we see the video again later in the series, her bracelet is visible again.
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.