Goof (revealing mistake): While Kitty is consistently referred to with female pronouns throughout the series, the lion that plays Kitty is a male lion.
Goof (continuity error): Throughout the episode, Wednesday's hairstyle changes - sometimes multiple times in a single scene - from braids to a double-ponytail style held with multiple bands and back.
Goof (continuity error): The number and positions of the cookies Grandmama and Uncle Fester offer Mr. Hilliard change between shots.
Goof (continuity error): When Uncle Fester puts the bulb in his mouth the second time, it is pointed straight out. In the next shot, it is angled to the right.
Goof (boom mic visible): In the shot of Uncle Fester getting down from the tree, the shadow of the boom mic is visible on the door of the house.
Goof (continuity error): When Gomez and Morticia talk in the conservatory, the sash on Gomez's robe is knotted toward his left. When they go into the living room to talk to Wednesday, it is centered.
Goof (continuity error): After Gomez takes the picture, the black smudges on his and Morticia's faces change between shots.
Goof (continuity error): When the Addams receive a letter from Professor Simms the genealogist, Morticia's necklace changes from a small clear stone to her signature larger black stone.
Goof (continuity error): When the mailman arrives, Thing takes two letters from him. He only passes one letter on to Wednesday. (This is due to the mailman's scene being reused footage from the pilot episode.)
Goof (boom mic visible): Around 12 minutes into the episode, what appears to be the shadow of the boom mic, in addition to another shadow, is clearly visible on the jackets of the two visitors.
Goof (continuity error): When the robbers raise their heads out of the crab-bobbing tub, their faces should be sopping wet and dripping, but they are barely damp.
Goof (errors made by characters, possibly deliberate errors by the filmmakers): When Gomez introduces the robbers to Fester, he gestures to Claude when he says Marty's name, and vice versa.
Goof (revealing mistake): When Thing hands Wednesday and Gomez the mail, the table cloth is moving, indicating a person underneath.
Goof (revealing mistake): When Mr. Harris drops the fish into the piranha tank, the prop fish can be seen in the bottom left corner of the tank after its "skeleton" has been thrown into the air by the vicious piranhas.
Goof (revealing mistake): When Thing pours the tea, part of a sleeve can be seen on his wrist.
Goof (factual errors): At one point Gomez refers to their pet lion, Kitty, as "she" even though the lion is male. Kitty's gender is evident by the massive mane.
Goof (audio/visual unsynchronized): When Lurch plays the harpsichord at the beginning, the movement of his fingers does not match the music that is heard.
Goof (revealing mistake): In the opening shot of Cousin Itt doing his magic act, Felix Silla is not wearing the bottom truss of Itt's hair and his legs are visible.
Goof (continuity error): When Fester blows open the painting to access the safe, the safe's door is already hanging off its hinges before the painting even detaches from the wall. Also, the smoke from the explosion clears much too quickly.
Goof (audio/visual unsynchronized): After Lurch receives the punch ingredient from Thing, he groans but his mouth doesn't even open.
Goof (errors made by characters, possibly deliberate errors by the filmmakers): Gomez says "Uranus transits Jupiter," however, such a transit would be impossible to see from Earth.
Goof (continuity error): When Gomez, Morticia and Lurch examine the freshly-caught boot, the position of Morticia's hand changes between shots.
Goof (revealing mistake): Obvious jump in the film when Max's toupee fixes itself on his head.
Goof (revealing mistake): When Pierre the Moose's antler's are moving, the string controlling the left one is visible.
Goof (continuity error): The length of Gomez's watch chain that is exposed changes multiple times during the mock appointment with Dr. Itt.
Goof (continuity error): The 'X' Gomez makes on Morticia's sleeve disappears immediately after he makes it, and is never seen again.
Goof (continuity error): When Gomez is looking at the ticker tape, some of it droops into a wastebasket, then is pulled out. In the next shot, it is in again. Gomez's hands on the ticker tape also change position in this shot.
Goof (continuity error): When Lurch tells Gomez and Morticia that Cousin Itt and Uncle Fester are both gone, he is not looking directly at them. It then cuts to a different angle, and he is facing them.
Goof (revealing mistake): (at around 7 mins) When Gomez opens the conservatory door for Morticia, he places his hand inside the cutout for the glass. This reveals the fact that the prop door does not actually have glass in it.
Goof (continuity error): When Grandmama explains about being high school friends with Hester Frump, she is facing Gomez. It then cuts to a longer shot, and she is facing Morticia.