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.
Revealing mistake: When the piano lid smashes Cary Grant's fingers, the lid obviously stops inches above his hand, even though a drink is positioned on the piano in an attempt to hide the gap.
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.
Audio problem: As the short starts, a hand is drawing several animals with musical instruments to be in the orchestra. And during this there is a music score with the animation. The second one is a pig with a tuba. As the left hand reaches in to pull the picture of the pig away, there is a glitch in the music, it cutting out for a moment with a rough scratchy pop sound, then coming back in as the right hand begins drawing a bird with a violin. (00:00:45)
Continuity mistake: When Goodwill captures the pigs (except for Porky and Petunia), there are "X" marks on the couch. When Porky and Petunia walk past the couch to look for the four other pigs, the "X" marks have gone.
Continuity mistake: When one of the ghosts scares Donald with chains, Donald takes his net with him when he jumps off. When Donald dives into the chest of drawers in the next shot, he has no net.
Continuity mistake: When we see the animals change seats at the start of the cartoon, you can see there is an aisle in the middle of the theatre, but when the show begins in the next shot, the aisle has disappeared.
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.
Other mistake: In the opening credits the actor Everett Brown is credited as Everette Brown. (00:01:05)
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: 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.