The real house in Camden, ME used for Lana Turner's home was duplicated at 20th Century Fox, so that Turner did not have to travel to Maine to shoot any scenes, and its interiors built on sound stages. When Diane Varsi leaves the real house to go to school, the floral wallpaper of its real-life foyer can be seen through its open front door; the soundstage set had light grey walls in its foyer.
(At around 1h53m) When Hyde is chatting with Principal Rossi at the Soda Fountain and reading letters home from soldiers in the war, there is a calendar behind them that reads June 1942. The month indicated should actually be August of that year: the 1st falling on Saturday, a 31-day month prior and a 30-day month succeeding. It actually shows June as having 31 days. June 1, 1942 was a Monday.
The car in the opening scenes has no windshield, when it's stopped at the railroad tracks and when the car is shown from behind. Apparently, they were concerned about glare or reflections of scenery or crew.
In an exterior towards the end of the film, a sign can be seen advertising the Rexall Drug Store in Camden, ME, which doubled for Peyton Place.
A diesel electric locomotive is seen pulling an approaching train in an early scene; but a steam train whistle is heard instead of an air horn.
When everyone is dancing at Alison's house, the sound of their feet on a wood floor is heard. But the floor is carpeted and there wouldn't be a sound of their shoes.
After Dr. Swain tells Lucas Cross to leave town for good, Lucas throws an axe at the cupboard. Nowhere in the shot does the axe hit the cupboard and yet the plates, cups and other items on the shelves break or fall off.
All of the women's hair styles and clothing are strictly 1957, not 1941.
Early in the film, a view is shown through the window of a ground floor parking lot next to a business. Some of the cars are of the early 1950's. The time frame here is 1941.
Mike Rossi and Dr. Swain are driving in a car and they come to a stop sign. The sign is red. All stop signs were yellow (with little round glass reflectors in the letters) in the 1940s (the time of this picture) and stop signs were not changed to red until the mid-1950s.
Allison plays classical music on an LP (33 1/3) record changer. The LP was not developed until 1949.
The record player is playing Johnny Mercer's song "Dream" during the making-out party, which takes place in 1941. "Dream" was not written and published until 1944.
When Mr. Rossi introduces Miss Thornton at the senior prom, the audience is heard applauding a moment before they are actually seen applauding.
When the army bus taking the Peyton Place draftees away drives off, the camera crew is briefly reflected on the two last windows of the bus.
The defense attorney calls Connie to the witness stand while the prosecution is still presenting its case. The defense cannot call witnesses until the prosecution has rested.