Goofs

During the passport scene, when the brothers try to get off the boat by impersonating Maurice Chevalier, neither Zeppo Marx (the first brother to try) nor Groucho Marx (the third to try), get Chevalier's passport back from the officer in charge, yet Chico Marx and Harpo Marx each have it as they approach the front of the line.

When Groucho Marx and Chico Marx hide under the table in the chart room (before their encounter with the Captain) Chico has a cigarette in his right hand. He didn't have it before diving under the table.

Groucho Marx position on the bed changes, when he 'shysters' a shyster layer.

When Harpo and Chico enter Joe Helton's stateroom, the door is at the end of a corridor. The camera angle then shifts to inside the room and the shot out the door shows the corridor runs parallel rather than perpendicular to the doorway.