The Glove That Rocks the Cradle - S7-E16
Continuity mistake: At the very end of the episode, the handwriting on the gravestone and the size/shape of the gravestone that's drawn in the comic book completely change between shots.
Pretty Little Liars (2010)
1 mistake in The Glove That Rocks the Cradle - chronological order
Starring: Lucy Hale, Ashley Benson, Sasha Pieterse, Shay Mitchell
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.