Burke notably never lights his cigar, but at 46:00 he appears in a huge cloud of cigar smoke immediately following an unlit cigar scene.
At 35:00, the sailor throws a lifebelt overboard from next to the door. A moment later the lifebelt hangs there again.
The ship's doors, even the external ones, are simple wooden ones with house doorknobs.
The opening shots show a ship enclosed in heavy fog, yet a close up of the ship's fog horn show it with no fog at all.
At 25:24 the light starts to go out before Jimmy flicks the switch.
When Charlie fires three times at Erickson, his gun is pointed at the floor, but Erickson grabs his wrist, where he has presumably been hit.
Up until 15:00 when Charlie questions George and Rona on deck, the ship is as steady as if it was solid ground (which the film studio was), but in this scene the rise and fall of the ocean background proves that the ship pitches. This would seem too dangerous for the booking of a knife-throwing act, where sways could too easily influence a thrown knife.
At 21:54 Chattanooga Brown burns his bottom on a kitchen griddle, but he does not burn his hand when he touches it to help himself down three seconds later.