Goofs

Polly is lifted off the rock by a large Sikorsky H-19. In the next scene we see a different helicopter, a tiny Bell H13 parked outside the hut where the next scene takes place.

Nighttime. Medium shot through doorway where Rose phones boyfriend at boarding house. White poster on paneled wall beyond her. Jump cut to closeup of her calling boyfriend shows large aerial falls photo & calendar (as seen in the other shots). When boyfriend immediately calls her back there's but a blank wall having no white poster nor calendar at all.

When Rose is fleeing from her husband, she is carrying a purse with a green scarf tied to the purse's handle. She then lays her purse down on a table in a futile attempt to make a phone call to the police. On the next cut after spotting her husband though, she grabs the scarf and starts running up the stairs; however, there is now no purse attached to the scarf.

After Rose gets strangled in the bell tower, the overhead shot shows her holding the green scarf, and it is next to her shoulder. In the next overhead shot, in a closeup, her arm is outstretched and the green scarf is an arm's length away from her shoulder.

As Polly is being lifted into the helicopter, the seat belt on the lift appears, disappears and reappears between shots.

The boat leaves the forebay of the Toronto Power Co., which is about 1/2 mile above the Falls. By the time they start to scuttle the boat, they are shown about 300 yards above the Falls, yet still have time to smash holes in the bottom of the boat. At a current speed of about 12 knots (as stated by one Niagara Parks Policeman in the film), they are moving at 440 yards per minute, thus would have less than 30 seconds before going over the Falls.

The police rely only on the "identification" of Loomis' "widow" to determine the identity of the battered body.But since Loomis is a veteran of the Korean war,His fingerprints would be on file with the US Defense Department, It is standard practice for any police department to check these. Of course this would have only taken a few weeks to have confirmed in 1953.

Beginning of the film. Cutlers are at the falls. He's above her to take a solo pic and she refuses to back up. The camera is an Argus C3 rangefinder with shutter trip button on top like all cameras. He lowers the camera as if he 's snapped a pic but all he's really done it cock the camera shutter and not tripped it via the button on top.

When George Loomis breaks the record at the dance party, he promptly returns to his room, Cabin B, where he opens the door revealing a blank wall about 3-4 feet inside the doorway.

Polly backs away from Loomis on the wooden platform under the falls, breaking a section of wooden railing, nearly falling over. Loomis catches her. After their brief hidden conversation, Polly returns to the spot, joined by the rest of the group, returning back. None of the group notice the broken railing, despite walking right next to it and the obvious danger.

Opening scene with Rose smoking in bed. Rolls over to pretend sleeping when Georges' key hits the door. Entering room he'd have encountered the smoke cloud and smell indicating recent smoking activity.

Rose awakes in her opening scene wearing bright red lipstick and full makeup.

When Rose (Marilyn Monroe) comes out of the shower, she is in full facial makeup (lipstick, eye shadow, mascara, etc.). Woman do not, as a rule, exit a shower in full facial makeup since washing one's face is sort of a requirement during a shower.

When Rose reads the postcard she pulls from the rack concerning the plan and "their song", only the word 'in' has a dot directly above the i. For 'everything' and 'Chicago' the dot is two letters farther downrange, landing above the 'g' and above the 'a' respectively.

The opening shot looks south along the crest of the American Falls. We learn a moment later that it is supposed to be 5 am; if the sun is up at all it should be very low in the east. The actual light on the Falls is from a rather higher angle.

In the next shot, the camera pans down and right to show a rainbow deep in the gorge, placing the sun high in the northeastern sky - impossible in the Northern Hemisphere at any time.

While energetically explaining the local layout to Ray and Polly Cutler, Mr. Kettering describes Chippawa, Ontario as the scene of a major American defeat in the Revolutionary War. However, U.S. forces in the Revolutionary War got no closer than 75 miles from the area. In fact, Chippawa was the scene of a major American victory in the War of 1812.