Steve's photo of Lora as a 'mother in distress' shows no people in the background, but when Lora was seen looking for Susie at the start of the film, the boardwalk is packed with people.
When Steve gives Lora the photo of "Mother in Distress", she takes it portrait style. The next shot she holds it landscape style.
At about 0:17:00, when Lora holds the photo that Steve took, the hand holding the photo has on very light-colored nail polish, whereas Lana Turner is wearing bright red polish.
When Susie tells Lora she is going to Denver to school, Lora says that is 1,500 miles away from New York. In reality, it is 1,777 miles.
Susan Kohner's bedroom clock radio is unplugged throughout both its scenes, although she switches it on to music in the second scene.
When Steve and Susie go riding together, their horses jump a low stone wall which one of the horses knocks revealing the whole thing to be a lightweight single-piece prop.
Some night time scenes were filmed using a filter to darken scenes. BUT this technique leaves the sky blue when in fact the night sky is always black! Further, detail (both close and distant) is evident, when in fact it would, should fade, disappear, into the shadows and darkness of the background.
When Lora is posing for the flea powder ad in 1947, several New York City Transit Authority R16 subway cars built in 1954 can be seen passing outside.
During a Broadway montage sequence set in 1951, a theater sign advertising Ricardo Montalban in the musical Jamaica can be seen. It didn't open until 1957.
In the top right corner as David Edwards arrives in Lora's living room after she becomes famous.