Then it's the Kraang and the Turtles against said Abomination, as Raph is quick to throw in Leo's face.
Foreshadowing: Whether this was unintentional or not, there is a picture of a snake on the mutation board that Karai used to create Justin. Ironic considering this is the type of mutant that Karai turns into a season later.
Fluffy the Terrible: Mikey calling the mishmash mutant monster "Justin", if only because his other idea wasn't good enough.
Girly Scream: Mikey, freaking out about the cat DNA being absorbed, just before Justin is born.
Lack of Empathy: As stated above, Karai abandons the Turtles even though the Eldritch Abomination attacking them was her own fault, and when Leo points out that he trusted her, she mocks him.
Never Trust a Trailer: The official promo for this episode shows the Turtles as they face "face their toughest decision ever"; pizza omelette or omelette pizza. There's exactly one shot of the Turtles arriving at April's school.
The promos and the official description also don't indicate at Karai's role in the episode and the Turtles attack on the Kraang's WWGP lab.