Return of the Dead Guy - S3-E10
Continuity mistake: When Ravi is bitten on the top right side of his head by Don E, there is a noticeable hole in the pantyhose he is wearing to disguise himself. Just a few seconds later, they show the right side of his head again and the hole has disappeared. (00:28:20)
Looking for Mr. Goodbrain, Part 1 - S3-E12
Continuity mistake: When Liv and Peyton are talking in the morning, Liv is holding her coffee mug and her left hand is on the counter. When Peyton says the cover picture looks like a monster and the shot changes, Liv's arms are now crossed and she's holding the mug higher up.
Continuity mistake: When Clive is interrogating Rudy (the time Liv pulls the coffee mug prank), Clive's pen is in his notepad. When Rudy is leaving, there's a shot of the pen on top of the notepad. It's back in the notepad in the next shot.
Continuity mistake: When Jason hands Liv the lawn darts, she grabs the tips (so the handles are pointed up). In the next shot, she's holding the handles and the tip are pointed up.
Continuity mistake: When Justin jumps on Harley's truck, there's no rearview mirror. When he's flung off and Harley drives away, the truck now has a rearview mirror.