Prom Wrecker - S2-E5
Plot hole: In this episode all the students say Hollywood Arts has never had a prom before. But in the first episode, 'Pilot', Rex says to Cat after she runs out to tell Tori, Robbie, Andre and him that Sikowitz wants them to come back into the classroom, "Just like you wanted a date to the prom last year."
Plot hole: In the episode where Gabe wants PJ and Teddy to pretend to be his parents when his teacher wants to see them after getting in trouble at school, it is established that Gabe's elderly teacher is short-sighted. When he asks "How many fingers am I holding up" his teacher gives an incorrect answer. However, later in the episode, his teacher spots Teddy on a date at the cinema (movie theatre) and assumes she's cheating/having an affair. How could she have seen Teddy from a row in-front, when Teddy is facing the audience and not the teacher, if she couldn't see how many fingers Gabe was holding up close to her face?
Plot hole: It is revealed that Malia has been living as a coyote for eight years but earlier in the season it's shown that all shape shifters lose their powers and becomes human during a lunar eclipse, which happened in the midseason finale. So why didn't Malia turn back?
Plot hole: In the pilot Jimmy finds out Lucy is pregnant while visiting her cell. In S2 E21 (Inside Probe) he finds out while taking to Lucy on the prison phone.
The Muh-Muh-Muh-Murder - S1-E25
Plot hole: Daffy isn't able to escape Porky's house until he gets the keys, but later it is revealed that the reason he couldn't get out was because he was too weak to open the door. If that was the case, the keys shouldn't have been able to help him get out.
Plot hole: Kings Boomer and Brady had to earn their king rings and the powers contained within, however, King Boz was just handed the ring, yet it kept its power.
Molly's Neverending Story - S5-E5
Plot hole: At the very end, Molly gives Peggy's church friends each a gift for their advice with changes she made to her book. Peggy says, "You didn't really need their notes, it was already a very good read." The problem is, there's no way she could have made any changes from the time she talked to them to the time Mike sends the email to the publisher. Molly actually says from the closet, "They wanted me to take my book to a dark, dark place." When did she actually incorporate their notes?