The number of remaining glass vanes in the small office window that Richard shatters changes from view to view.
When Richard gets into bed at Paula's parents' house, he slams down his toothbrush on the bedside table. When Elanor enters, the position of the toothbrush has changed. Then when she tucks him in and kisses his forehead, the toothbrush changes position again.
As Jessica Tandy empties the pot of grits onto Burt Reynolds plate, she utters the line "nobody here eats this stuff." This is obviously a voiceover as Tandy's mouth is not moving.
Goldie Hawn mentions Teresa Wright not being on the train in Since You Went Away (1944). It was Jennifer Jones, not Wright.