The Authority/The Virus - S2-E10
Revealing mistake: In "The Authority," when the Wattersons return to normal and start screaming "The brake!", Darwin's animation repeats itself in the same frame. Thanks to the slow motion the scene is going in, this error is easy to spot.
Other mistake: When Gumball tries to comfort Alan, Alan opens the door but Alan is a balloon, with no hands to open a door. (00:04:35)
Plot hole: In the pressure, Masami pretends Darwin is her boyfriend. However, in the storm, Masami is in love with Alan. So why didn't Masami just pretend Alan was her boyfriend?





