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.
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)
Continuity mistake: In the Day O scene. Lydia is sitting at the table next to her father. When the possession takes place, Lydia is not longer at the table and in a brief moment is seen in the corner hiding, laughing behind her chair. The camera closes in on the song and dance, and when pulls it back Lydia and her chair are gone and the corner is empty.
Visible crew/equipment: There is a unknown 3rd person helping Charles and Otho remove the model from the attic. You can see him briefly just as the scene ends on the left side of the screen moving the front portion of the model, closest to the camera, between us and Charles. Charles and Otho would be hard put to move that entire model by themselves. Otho says it is sectional, but they still seem to move the entire model in one piece.