Howard shatters Dominique's slightly damaged fireplace slab with a chisel and says, "Now it's broken and has to be replaced." When Dominique asks Howard if he can replace it, the next shot of Howard shows him kneeling in front of the not-yet shattered marble slab.
(at around 15 mins) When Wynand is in his office talking with Toohey, the shot of the seated Wynand shows him looking at the bottom half of the front page of his newspaper. When the angle shifts to Toohey, Wynand is reading the top half of the front page.
When Roark is having his first meeting with Toohey, he has a copy of the Banner in his hand. When Roark says, "I read that in your column yesterday", the paper in his hands is open. The scene shifts perspective to Roark from behind, and the paper is folded.
When the Banner prints its front page story "The Truth about Howard Roark", a six-paragraph story is shown, but the first three paragraphs of the story are exactly the same as the last three paragraphs.
When Cameron smashes the window in Roark's office, the flag outside the window flying in the skyline is not rippling and, therefore, is part of a photographic backdrop rather than a live location.
When Dominique is taking the construction elevator to the top of the skyscraper, the camera (from Dominique's perspective) zooms in slowly to the top of the building, but there is no elevator shaft.
When Roark burns Cameron's papers in the latter's contemporary New York office, he does so in a pot-bellied stove about 75 years out of date.
The main thrust of the film is one man's battle against convention and group-think. Yet one of Roark's biggest foes, the New York Banner, has office interiors that are thoroughly ultra-modern and unconventional for the time.
When Howard and Dominique first speak to each other, they do so in a normal voice, despite the distance between them and over the quarry's noise.