Continuity mistake: When Emily and Alison are talking about Paige, the amount of water in Emily's glass changes between shots.
Continuity mistake: The position of the Bluetooth sniffer changes in Emily's hands 2 shots after Aria passes it to her in the car.
Continuity mistake: Sydney's coffee changes position 3 times after Emily sits down to talk to her before picking it up to leave. Note the creases on the cardboard of the cup.
In the Eye Abides the Heart - S7-E15
Continuity mistake: In the second scene with Emily and Pagie at The Radley, Emily's hands are constantly switching from her glass to away from her glass between shots.
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.
Cat's Cradle - S4-E3
Continuity mistake: When Hannah is on the phone to Emily, Hannah pours a glass of fizzy drink (coke or whatever) and is about to drink from the glass, in the next shot she takes the can and walks away and the glass isn't seen again.
Continuity mistake: When Spencer and Toby are having lunch, she lifts her water bottle. Between shots, the hand she is using changes. (00:46:35)
Through Many Dangers, Toils, and Snares - S2-E14
Continuity mistake: When Emily circles the word "yes" on the chalkboard, the way the circle is drawn changes between shots.
Continuity mistake: In the scene when Ezra rides up behind Aria in the Limo, you can see his hand up to his head, as if on the phone. The camera then cuts to Ezra in the Limo and you see him answer his phone. (00:22:25)
Revealing mistake: When the police ring Ashley's phone, we catch a glimpse of the screen as she answers it. The phone is not in call mode.
Revealing mistake: Judging by the interface, the video of Jenna and Toby sleeping together is played through Windows Media Player. When this program is playing a video, the big blue "Play" icon becomes a "Pause" icon. But whenever the video of Jenna and Toby is playing, the "Play" icon is still showing. It's obviously not an actual video being played.
Continuity mistake: Right after Toby tells the girls to keep everything about Elliott Rollins a secret, Aria's hands instantly move from above her knee to below her knee between shots.
The Melody Lingers On - S5-E23
Continuity mistake: When Ashley and Ted are in the kitchen talking about Allison's trial, Ashley's hands go from raised to down by her sides and back again between shots when she says "It's not a way to start a life together."
The Melody Lingers On - S5-E23
Revealing mistake: When Aria calls Spencer after the first trial scene, Spencer's phone is not in call mode.
The Blond Leading the Blind - S2-E17
Continuity mistake: In the flashback to the Halloween party where Alison finds the note from A and removes it from the knife, she is either holding the knife upwards or downwards depending on the shot.
Continuity mistake: When Hannah is kissing Caleb, her hair changes position several times between shots.
Continuity mistake: When Fury and Spencer are playing ping pong there is one scene where Fury is holding the ball and Spencer is empty handed, then as the scene progresses Spencer is also holding a ball.
Continuity mistake: When Jason first appears in the show he is played by Parker Bagley and is portrayed as a proper, motivated and well held, wide structured man, but disappears for a season or so, and is replaced by Drew Van Acker, and is now portrayed as a paranoid druggie, with mental health issues, and a lanky skinny structure.
Continuity mistake: Hanna and Alison are at Hanna's home, when the bell rings. Hanna takes a look through the window directly next to the door, and claims it's just Travis. When she opens the door and goes outside, there is no window visible. At least not any kind that could have seen Travis. It seemed to just have disappeared mysteriously. The transition of shots between the set of hanna's interior and exterior is done very poorly. (00:12:10)
Continuity mistake: Mrs Sullivan circles "nosey bitches" on a paper (someone's file) and the circle is overlapped at the bottom. When the camera moves out the circle changes and is disconnected from the top instead.