Continuity mistake: In the scene where Coco tears up the photo of Luke with the women, he tears it carelessly, starting with the upper left corner. The end shot of the movie shows the same photo, reassembled, showing a neat, cross-wise tear, with the center of the tear directly over Luke's heart.
Continuity mistake: In the last scene of the movie Dragline grabs Boss Godfrey, the man with no eyes, and begins to push and shove him. In the scene you see the hat that Boss Godfrey's wearing fall off. But the next instant, after the camera flashes to another view and immediately comes back the hat mysteriously appears again and falls off again.
Continuity mistake: Luke uses an axe to break his leg irons on a wood stump. He asks boy to bring chili powder curry, and when the tins are put on the stump, there's no broken chain. Shortly afterward, bloodhounds and guards arrive and find bits of broken chain on the stump.
Continuity mistake: On the same day that Luke got thumped to the ground by Dragline, his injuries cleared up in time for the classic card game. During the fight, the dirt marks on Luke's back constantly change.
Factual error: When "Lucille" turns her radio on before she washes the car, the music is heard instantly. Radios in the '40s were tube models which took time to warm up and start playing.
Continuity mistake: The chain gang start to resurface road. "If the man wants speed, let's give him speed". At first only Luke is shoveling fast. Notice muscle-man next to Luke. From different POVs, he is at first slow, then fast, then slow again. It's easy to miss: just watch the shovels.
Continuity mistake: At the beginning of the scene when Luke's mother comes to visit him, the position of her glass of water changes from one shot to the next.