In the Eye Abides the Heart - S7-E15
Other mistake: In this episode, and a few episodes afterwards, Aria's phone's battery is at 76% every single time she looks at her phone, until finally dropping to 70% in episode 17 of season 7.
Pretty Little Liars (2010)
1 other mistake in season 7 - chronological order
Starring: Lucy Hale, Ashley Benson, Sasha Pieterse, Shay Mitchell
Someone to Watch Over Me - S1-E20
Continuity mistake: After Jenna is slapped by Hanna in the bathroom a single tear streams down her right cheek. The next shot of Jenna shows the tear track on her left cheek.
Trivia: The theme song for the show, 'Secret' by The Pierces, was suggested by Ashley Benson.