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Arsenic and Old Lace (1944) Poster

Goofs

Audio/visual unsynchronised 

When Jonathan is trying to find Mr. Spenalzo, he mentions to Elaine that his friend Dr. Einstein is "somewhat of a magician." However when he says this, his lips aren't moving.
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When Teddy is playing the harpsichord near the beginning of the film (c. 6'45") the music on the stand is a duet for an instrumentalist with a keyboard accompaniment, hence the three music staves, yet we hear Wolfgang Amadeus Mozart's Pianoforte Sonata in A minor movement.
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Character error 

Near the end of the film, Mr. Witherspoon addresses Mortimer as Mr. Witherspoon and Mortimer corrects him and saves the scene. Cary Grant appears to be genuinely amused by his mistake.
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When Dr. Einstein is begging Mortimer to flee from Jonathan's murderous rage, Cary Grant ad-libs to Peter Lorre, "Stop underplaying, I can't understand you."
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As the film opens, the narration on screen tells viewers that the action begins at 3:00 PM. However, when Mortimer & Elaine go up to the window at the marriage bureau, the clerk says "Good morning, children".
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Continuity 

While Mortimer talks to his aunts early in the movie, the rice in his hair disappears and moves around between shots.
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When Mortimer discovers the body in the window seat his hair changes from being flipped over his forehead to being neat and then back again without any obvious motions that would have changed it.
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Just before Jonathan and Dr. Einstein show up, Aunt Abby arranges the two candelabras so that they are both facing forward. After Jonathan and Dr. Einstein enter, one of the candelabras is facing sideways.
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A policeman named Rooney has his rank fluctuate between "Lieutenant" and "Captain" throughout the film.
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When Mortimer Brewster pushes the policeman O'Hara out the front door, he firmly shuts the door behind the policeman. However, he immediately goes to leave the house and, when he approaches the door, it is wide open.
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When Mortimer first thinks of calling Judge Cullman, he raises his left arm. In the next shot, his right arm is raised.
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Crew or equipment visible 

Dr. Einstein stumbles and falls into the window seat in the dark. He strikes a match, and the wire that is powering the flickering light in the palm of his hand is clearly visible trailing out from his sleeve.
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Factual errors 

The hymnal that the aunts use to hold services over Mr. Hoskins is "Hymns For Creative Living," published in 1935 by The Judson Press. The hymn that they sing ("There is a Happy Place") is not in that hymnal.
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Incorrectly regarded as goofs 

The movie opens with the Brooklyn Dodgers winning a baseball game on Halloween, weeks after the end of baseball season. This is a gag to suggest that the only time the Brooklyn Dodgers could win is on Halloween, similar to saying when pigs fly.
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Revealing mistakes 

When Mortimer runs into and flips over the chair, clearly visible are large hinges attached from two legs of the chair to the floor, stopping it from flipping completely.
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See also

Trivia | Crazy Credits | Quotes | Alternate Versions | Connections | Soundtracks

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