Continuity mistake: When the seven dwarves run scared down the stairs and out of the door, Dopey pulls the handle of the door from the inside until it breaks out and falls away. The next scene when the dwarf opens the door, the handle is there again. (00:33:00)
Continuity mistake: During the locust invasion, two of Paul Muni's men collapse and are covered in locusts. Muni picks them up, but suddenly, all of the locusts have disappeared.
Continuity mistake: In the scene showing Groucho being chased across the cars as they enter the race course, in the shot from behind you see him running along the rail only to slip, the following shot is from the front and shows the same slip he's already made.
Continuity mistake: When Robert Conway meets the High Lama, the High Lama is shown in a long shot without his crutches. As Conway approaches him and we see the High Lama up close, the crutches suddenly appear.
Continuity mistake: As the orchestra begins playing, the lion is waving back and forth at each side as he conducts the music. In the far shot, his tail is not visible. But when it cuts to a close up of him, suddenly you can see his tail. It is large enough that the yellow tail should have been visible against his black suit in the far shot. (00:02:35)
Continuity mistake: In a saloon, Moe and Curly are playing poker with Longhorn Pete, the proprietor. Among Curly's five cards are an ace of hearts and an ace of diamonds. Moe's cards include an ace of spades and an ace of clubs. They pass some of the cards to each other under the table in the hope that one of them will wind up with all four aces. When their cards are shown again, Curly and Moe each have an ace of spades and ace of clubs. The ace of hearts and ace of diamonds have disappeared.
Continuity mistake: When Stan and Ollie arrive at Brushwood Gulch, they show Mickey Finn the deed they've got for Mary Roberts, and it has a couple of holes in it from where Stan has been keeping it in his shoe; Ollie even unfurls it to show the camera it's got holes. But in every other shot after that, whenever the deed is shown, it's got no holes in it whatsoever and is perfectly clean.
Continuity mistake: When we see the projection unit in the projection room towards the end of the cartoon, you can see it has a black door and there is also a small window with gold lines in it, but when the goose opens the door in the next shot, the door is now blue and the gold lines have disappeared.
Continuity mistake: When Goofy searches through the dresser drawers one of the ghosts causes trouble, then Goofy breaks through the top of the dresser and winds up trapped inside, but when all four ghosts appear the dresser top is perfectly fine and that damage has vanished. Also, two of the drawers (one large and one small) fall out of the dresser, but as the four ghosts are pushing the dresser those two drawers have reappeared in their proper places.
Continuity mistake: The entries into Quartermain's journal are supposedly covering events during 1881 and 1882. The entries consist of a day and a date, but no month. Taken in order, they cannot fit into the 1881-1882 calendar. For example, the two entries immediately before the June eclipse can only be in August 1882.
Continuity mistake: Helen Bartlett is on the phone with her friend Daisy, who says she can't join her but is conned into leaving her workplace by Carole Lombard faking suicide. During the scene, Una Merkel's desk is arranged differently depending on the camera angle; a closer angle has room for just the telephone, while in the wider angle she also has a notebook in front of her. (00:06:50)
Continuity mistake: When Porky arrives home, you can see a window looking outside to the right of the front door, but when Porky shoots the man upstairs a second time, the front door now leads to a hallway with a staircase.
Continuity mistake: Goodwill captures four of the pigs and confines them in a pillory, a wooden framework with six holes. The head of each pig is sticking through one of the holes. After Goodwill captures Petunia, Porky enters the laboratory and discovers the pillory. Five pigs are now confined, and the sixth hole has disappeared.