At film end as camera starts pan across Café front, first hanging 'tin' sign is for 2 liter soda 89c. Liters didn't come into U.S. sales until PepsiCo introduced the first two liter sized soft drink bottle in 1970, likely long after Whistle Stop decline.
When Ninnie is voicing the story of Ruth's cancer, she states that Ruth is moved to the Threadgoode house and placed downstairs. The following scenes indicate that Ruth is in an upstairs bedroom, as we see Idgie looking out the window, and looking down at the kids playing ball, and we see the tops of trees when Sipsey prepares the medications.
During one of Evelyn's visits to Ninny, Ninny is sporting a new hair-do. Her hair has been cut quite short and colored lavender. However, the next time Evelyn visits Ninny, her hair is once again very long and very white.
Evelyn pauses with the wrapped fried green tomatoes in hand and looks down the hallway. There are several people in the hallway, one is an older woman with an orange flowered robe and a bandaged left foot. She is seated facing Evelyn as she begins her walk down the hallway, but as Evelyn passes the seated woman she suddenly has her back to the wall.
When Evelyn picks up the note from Idgy to Ruth at the end of the film, she does not place the note back on her grave beside the honey. But when it flashes back to the grave the note has been placed back on Ruth's grave stone.
When Buddy hangs up the swinging rope off of the bridge before entering the house, he hangs it on a post on the right side of the bridge. However, when he goes to retrieve Ruth's hat later, he grabs the rope from the left side of the bridge.
When Buddy is chasing Ruth's hat down the tracks he gets his shoe caught between a guard rail and the main rail. Guard rails are typically used on bridges and at switches, but has no purpose in this location other than to catch Buddy's foot.
In the scene where the young women are in the boxcar (from
which they pass out canned goods), the box cars were obviously built by the set decorators. And wrong. The cars have outside bracing, common enough in the period of the film. But all outside-braced boxcars had their wood planks running horizontally, not vertically as in the movie.
When Frank Bennett's truck is retrieved from the river, as it's being hoisted up and spins, it is obvious that the engine/transmission have been removed, and a painted piece of sheet-metal put in place to obscure the void.
Despite the fact that the story takes place in the Deep South and all adults have (mostly passable) Southern accents, young Buddy has no southern accent at all, although he would in reality never have heard any other way of speaking.
The goof item below may give away important plot points.
At the end of the movie, it shows the condemned cafe with all of the soda tin advertisement signs. The tin "Ski" is advertised on the door. Since the movie took place between World War 1 and World War 2, the Ski sign is at a wrong time period. Ski came out in 1956 by Double Cola and the cafe was shut down shortly after Ruth's death (1939).