Corrected entry: When Debbie comes to be the nanny, obviously it's the beginning of summer as the children go to summer camp and are not in school. While the children are at camp, Fester meets Debbie, marries her and they move away from the family. The children are at still at camp preparing an early Thanksgiving play, meanwhile, Fester and Debbie celebrate their wedding anniversary... We also see the baby's first birthday, and since the baby was already a couple months old when Debbie arrived, it is not possible for Fester and Debbie to have been married an entire year.
Corrected entry: When the two Native American children are turning the two camp directors over the open fire, they are turning the handle in the opposite direction the camp directors are turning.
Corrected entry: Gomez and Fester are talking about how Fester should get a wife, and Fester says "For years, I've been watching you with Morticia". He can't have been watching them for years - he ran away before Gomez had even met Morticia, and came back just before Morticia told Gomez she was pregnant with Pubert (who is born shortly before this conversation takes place). Now, Pubert was a bit bigger than most babies at birth, but even so, Morticia couldn't have been pregnant for years. Also, Wednesday and Pugsley haven't aged that much, either.
Corrected entry: When Debbie is showing the Addamses the slides before she was going to kill them, she only shows two rich husbands and her parents. Yet earlier, Wednesday's friend shows her and Pugsley some trading cards, and he mentions that Debbie had three rich "husbands," all dead. Yes, there's Fester, but the cards aren't that up to date and he's not dead yet.
Corrected entry: At the beginning of the film we learn who Debbie is, but the newscaster mentions that she had a different name and disguise each marriage. Yet at the end when the Addamses are in electric chairs, she says that her husbands said, "Sorry, Debbie."
Corrected entry: In the close-up shot where Wednesday twists off the doll's head, that is Morticia's hands doing the twisting.
Corrected entry: At the beginning of the film, it's revealed that Debbie marries men, then kills them on her wedding night. But at the end, when she has the Addams family in the electric chairs, her speech suggests she was with each man a significant amount of time.
Corrected entry: When Wednesday, Pugsley and Joel are in the Harmony Hut watching Disney films, you see the hut from outside and there's no-one around. The three of them leave the hut and suddenly there is a group of campers waiting at the gate.
Corrected entry: When Joel is showing Wednesday and Pugsley the trading cards, Debbie's card shows her exactly as she looks now. Yet at the beginning of the film, we find she disguised herself and eluded the authorities for years because she is a master of disguise. How could the cards have such a photo?
Corrected entry: The hand that pops out of the grave to scare Joel at the end is supposedly Thing, but Thing's length stops near to the wrist. There's a lot more arm on the hand that comes up out of the ground.
Corrected entry: Although constantly referred to as a 'he', Pubert is in fact played by twin girls.