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 "Petrified Florist" film that is being shown at the theatre, Lester Coward sits at a table in the Desert Inn and in the background there is a sign that reads: "Tom Collins Straight Whisky Gin Fizz." But when Coward stands up and recites his poem, the words "That's all Folks" have been added to the sign.
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 lawyer Goodwill is in the secret laboratory, he picks up a bottle that has "Jekyll and Hyde Juice" written on the label, but when we see him with the bottle in the next shot, the words have disappeared.