Continuity mistake: When Jerry runs onto the record player, he runs next to a button panel and there are four buttons on it: Fast, Stop, Start and Change. But when he is pressing random buttons later on in the cartoon, a "Record" button has been added and the "Change" button has disappeared.
Factual error: The events depicted in the movie occur around the time of the California gold rush in 1848, yet every man and his dog wields an 1873 Colt Peacemaker.
Continuity mistake: When Elmer opens the door and finds Bugs at the dressing table in ladies' underwear, you can see the door is positioned on the left hand side of the frame. But when we see Bugs, the door is now on the right hand side.
Continuity mistake: When the General gives Donald a piece of paper to sign, the wording on the paper changes between shots.
Continuity mistake: When Bugs is holding the stick of dynamite that doesn't explode, the length of the stick changes between shots.
Continuity mistake: When Porky breaks an egg on the frying pan, you can see there is a ring on the stove, but after the mother eagle has hit Porky in the face with the pan, there is no ring on the stove.
Continuity mistake: Inside the church, while Holmes is talking about the mole inside the British Intelligence Council, the position of Meade's hands changes between shots. (00:58:29)
Continuity mistake: Near the end, as a plane is getting ready to run down the airstrip, Bogie knocks the gunman out, then uses the gun to shoot the plane in its tracks. When the machine gun starts to fire, it has a long strip of bullets, then fewer, and so on.
Continuity mistake: When Reginald Owen who is a British agent posing as a German hits a German Captain on the head the German doesn't have a hat on.When he pushes the German out of the car when the body falls out it has a hat on. (01:31:45)
Continuity mistake: When Bugs puts a cigar in Ala Bahma's mouth at the end of the cartoon, the background is blue with a pink curtain, but after the cigar explodes, the background is green and the curtain is blue.
Continuity mistake: When we see Elmer reading his book at the beginning of the cartoon, the strap of his gun switches shoulders between shots.
Continuity mistake: Robert Cummings is talking to a Viennese doctor. The doctor lights a match for his pipe. Then, in the next shot, there is no match.
Continuity mistake: Bela Lugosi offers John Berkes a cigar ("a real Havana"), but when he's relaxing, he calls him by his 'street' name, Fingers. The man nervously brings a hand to his collar, but at the cut Fingers' fingers are gone out of frame. (00:06:30)
Continuity mistake: When Daffy sees Dr Jerkyl's house, he is holding a telegram in his hand that disappears when we see him in the next shot.