Continuity mistake: When the Deitz family and their guests are eating, the bowls of shrimp are sitting on small mats. Delia and Charles's mats often change from black to grey colour, at random through the whole dinner scene. (00:48:45)
Visible crew/equipment: When the small priest emerges from the fireplace and then when he goes on to do the wedding ceremony for Beetlejuice and Lydia, you can see a thick black tube running out of the priest's right leg, trailed behind him. (01:18:30)
Continuity mistake: When Barbara picks Beetlejuice up from the model town, in one shot his arm is wildly shaking around in fury, but in the next close-up his arm is now tucked in between Barbara's fingers. (00:59:05)
Revealing mistake: When Beetlejuice is using "Zagnut" candy bar as the bait for the fly on his grave, the size of the "Zagnut" is not realistic - the fly should be much smaller than the "Zagnut" bar. (00:36:35)
Revealing mistake: When Maxie and Juno are jetted through the ceiling, check the stiffness of their bodies: they've been replaced by mannequins. (01:19:20)
Continuity mistake: After Betelgeuse knocks down the model tree, Adam places it back into its hole. Later on, as the camera zooms in on the whole model, you see the tree is still on the ground.
Continuity mistake: During the scene where the new family eat dinner for the first time, there are candles in front of the dad (they are in metallic candle holders). They are in an order like large, small, medium. But in the close up shot of the dad they have changed places to medium, small large. The sizes may be different but the concept of the mysterious shape shifting candle holders is the same. (00:19:55)
Continuity mistake: When Charles and Delia are sitting out on the white terrace, Charles holds a glass with brown coloured drink in it which is three-quaters of the way full, and Delia's glass is half full. When Otho walks onto the terrace, Charles's drink is clear-coloured and the glass is filled right to the top, and Delia's glass is now three-quaters of the way full. (01:01:35)
Continuity mistake: During the scene where the Deitz family and their guests get possessed to sing and dance along to "Day-O," the positions of the black and white napkins, the wine glasses, the cutlery, the wine bottles in the ice-buckets, etc., change many times throughout this completely hilarious scene. (00:50:20)
Continuity mistake: The photos Charles is holding of the Maitlands in sheets are 35mm photos based on the shape of the photo. The pictures Lydia took of them were Polaroid which are square and not as detailed or sharp as the other pictures, much less the same shape even if they were blown up.
Continuity mistake: When Barbara shows that they have no reflections by moving the horse in front of the mirror, Adam is seen waving his left hand (in the over-the-shoulder shot) and it cuts to a longer side shot as he's finishing waving his RIGHT hand. (00:09:15)
Other mistake: When Adam's headless body runs into the hallway to go shut the attic door, you can see a reflection of his body when he crashes into the banister. Ghosts don't have reflections, as seen in the beginning.
Continuity mistake: During the dinner party scene, the positions of the shrimp which hang around the small colourful sushi bowls often change. Sometimes they hang over the bowls, sometimes inside the bowl. This happens with Delia's shrimps especially. (00:48:55)
Continuity mistake: As Adam speeds towards Beetlejuice's foot in the miniature red car, the amount and position of plaster and rubble around Beetlejuice's foot changes between shots. (01:20:40)
Audio problem: When Adam, Barbara and Juno walk into the attic, Juno says "You should have been studying those lessons since day one." However, her lips never move.
Other mistake: If the Maitlands cannot be seen in a reflection being ghosts, then Lydia would not have seen them in the attic window in her camera, as that uses a mirror to reflect the image through the viewfinder.
Suggested correction: However, when Lydia moves the camera away from her face to get a better look, she had both eyes open when using the camera (with her right eye looking through the viewfinder). This is a recommended technique to help get a perspective and keep one's focus on the subject. This means she could have seen the Maitlands with her left eye, the one that had a direct view of the window.
This is not how the scene plays out. She first supposedly spots them while looking through her camera, which then causes her to take a better look with the camera away from her face. She would have no reason to do that if she didn't see them in the camera, which, as we know, would not be possible given they do not cast a reflection for the mirror in the camera for Lydia to see.
Or, she just saw the curtain move and thought that was odd, then moved the camera from her face and realised there were 2 faces there. There is no indication at all that she saw them straight away.
A curtain moving from an open window is not odd. You're really reaching here, and her reaction indicates she saw far more than a curtain moving. She literally stops in her tracks and dramatically lowers the camera - the same camera that she had to her face she was looking through. Anyone who has used an SLR camera does not use two eyes open, as it is nearly impossible to focus and see things, given one eye would be zoomed in and the other would be unaided.
Revealing mistake: When we see that Barbara and Adam are hanging out of the window in order to hide from the Deitz's, it cuts to Beetlejuice yelling "Oh boy. You guys are really a couple of spooksters." In this shot of him shouting, he does not have any white makeup applied to him, nor does he have any of the green patches that run down his neck. In this shot he does not look his usual "dead" state, but looks normal. They obviously forgot to make him look "dead." (00:56:40)
Other mistake: When Adam and Barbara have their sheets on, trying to scare the mother, they walk out in failure and Lydia takes pictures of the ghosts - polaroid photos fall out (too quickly) and Lydia picks up one which is already developed - they take longer. (00:39:25)
Revealing mistake: When the charred man is offering Adam a cigarette, you can see the hole in the headrest of the chair where the actor is sticking his head through. (00:31:49)
Continuity mistake: During dinner, Otho is speaking and Delia listens, her hand away from the glass on the table. A shot later she is drinking from it. (00:51:20)
