The Class Gets Frozen Yogurt - S1-E5
Continuity mistake: In the scene where Ethan and Kat are sitting outside the yogurt place, talking about how Kat didn't order anything, the bowl and spoon that Ethan has in his hands changes from being held to being on the table and back again repeatedly between shots, with no time for him to actually put it down or pick it up.
The Class Goes Trick-Or-Treating - S1-E6
Continuity mistake: When Cat is putting on her boots, she puts her right boot on. The camera cuts away and back, and she is putting on her right boot again but when it cuts away she is now putting her left foot down.
The Class Runs Into A Convenience Store - S1-E10
Continuity mistake: At the very end of the episode, Kyle, Ethan and Kat are standing in a line looking at Lina and Richie. On the close up shot of the three of them, Ethan is standing next to Kyle, but when the shot is from above, Kat is now in between them, with no time to have moved.
Chosen answer: Due to creative differences she has left The Class, with her last episode being that of Jan 8.
Boobra