Night of the Living Dummy III (1) - S2-E24
Character mistake: When Zane sees Rocky with the hockey mask, he seems legitimately terrified when he notices him. However, he was responsible for putting him there and no-one else was around. There is no reason for him to express real fear when he planned for his appearance the whole time. (00:11:44 - 00:12:08)
Suggested correction: He only pretended to be scared in order to fool his cousins, uncle and aunt.
Welcome To Camp Nightmare (2) - S1-E6
Other mistake: At the end of the episode, Billy's parents tell him that they are taking him to a dangerous place called Earth and then direct his attention towards the sky where Earth is visible in high detail in broad daylight of the atmosphere of whatever planet they are on. If Earth is visible in such great detail, and at daytime no less, then there is no way Billy could not have already been familiar with it.
Suggested correction: The character is aware that the earth is in the sky, just not that he was being trained for a mission.
There's a difference between noticing an object in the sky and not being familiar with a prominent object in the sky. The show is implying that Billy knows nothing about Earth when his parents point it out to him and tell him it's "a place called Earth." This would be like someone on Earth seeing the Moon almost every night of their life and then not knowing any basic thing about it, including its name, until they were a teenager.