It's a Mad Mad Mad Mad World

Plot hole: In the beginning of the movie, all of the cars turn to the left to head south. However, the map at the police station indicates that they had to turn to the right to go south.

Continuity mistake: Spencer Tracy says they will go to the crossroads and turn south (a right-handed turn according to the wall map he's looking at). When they get to the crossroads, they all turn left which would be north.

J. Algernon Hawthorne: Jolly nasty accident there. Jolly lucky nobody was hurt.
Mrs. Marcus: Where did you get that funny accent? Are you from Harvard or something?
J. Algernon Hawthorne: Harvard? Rather not. I'm English.
Mrs. Marcus: Sounds so foreign.
J. Algernon Hawthorne: Really?

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Trivia: Phil Silvers almost drowned whilst filming the scene when he drives his car into the river because he couldn't swim.

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