Walter O'Neil reads and partially crumples the note handed to him in his office. When he sits down behind his desk a second later, the note is perfectly flat.
When Sam and Martha as grown-ups are in Martha's old bedroom, they're sitting on the window seat with the doll. Martha starts to rise but Sam remains seated, yet in the next cut both are standing when they kiss.
When Sam first meets Toni, she is holding a fairly new, lit cigarette, and then 2 seconds later, is not holding one, and asks for one.
When Sam Masterson climbs over the fence after being beaten up, there is already a smear of blood on the fence where he places his hand, before he places his hand there.
Walter is slurring drunk when with Martha, but as the scene moves on he sounds completely sober.
When Sam and Toni are in the taxi cab stopped at a railway crossing waiting for a train to pass, cars can be seen coming up behind and passing them.
The same loop of film repeats, although subtly, the street scene by the Ivers factory as seen through Martha Ivers' office window.
When Walter O'Neil asks his secretary to get the county jail on the phone for him, he's connected and on the line with someone in two seconds.
When Martha drops Sam off at the hotel after their trip to the mountains, as she pulls away, you can see a black cable attached to the rear underside of her car.
In the DA's office, as Toni is questioned by Walter, the boom's shadow is seen above.
As Sam, after a beating, enters Walter's room with the butler John.
Before taking the shower in the hotel, while slipping her coat of, Toni winks up in the air with her left eye and shows a little smirk apparently to someone from the film crew.
In their adjoining hotel rooms, Sam Masterson offers to "run a bath" for Toni Marachek, but in the next scene Toni is taking a shower, and both characters are only ever seen taking showers at the hotel.