When the Danbys come into town for the final showdown, there are 13 of them. During the battle, two are shot down by Prudy, yet when they all come to the cannon at the end, there are still 13 of them.
During the fight at the beginning of the movie (in the mud), those fighting switch between being covered in mud and nearly mud-free.
When Prudy is grabbed in the butt by one of the fighters during the mud fight, you can see the exact same scene from a distance a few seconds before. The scene is used twice.
When Jason, as the newly appointed Sheriff goes to arrest Joe Danby, he is saved from being shot in the back by Jake. When the camera goes to Jake, he is behind and to the right of the Sheriff. However, in the shots showing the sheriff from the front, Jake is not visible in the saloon.
Before the final shootout, about a dozen Danbys are shown riding into town and dismounting. There is a cut to two men walking towards the sheriff's office, but when the camera cuts back, all the horses have now disappeared.
When the sheriff first goes to the new jail, he finds a bucket of red paint and yet nothing in the entire office had been painted red. The cell blocks were brick and the walls in the office were yellow.
During the fight at Emma's, a man gets a plateful of food mashed into his face. The "metal" plate folds like a paper plate.
During the time when the sheriff goes into the saloon the first time, you can hear the same background chatter sound track repeat at least 3 times just before the scream.
During the mud fight scene when Jason and the town council use the 'fire engine' to break up the fight, there is no water source and the engine has no water tank.
The town has just been built, and the mayor and council talk about how they haven't had time to correct the problems. However, the plants and shrubbery and trees all around the town have had to take a year or two to grow.
The sidewalk in front of the mayor's house is covered in dirt but is obviously made of raised concrete with a low curb.
Suzanne Pleshette is not listed in the cast listing as Patience.
Whilst in the hardware store, the major covers the hole in a metal washer with masking tape so that Jason McCullough can demonstrate his shooting skill. The movie appears to be set in the 19th century, and adhesive tape was not invented until 1925.
When Prudy is counting the number of the Danbys who will come to town, she calls Walter Brennan Milt Danby. Pa's name is never given, but Milt Danby is Pa's brother. She goes on to tell Jason that Pa's other brother Ira Danby has three boys and Milt has two. However, in the jailbreak scene, Pa Danby tells Luke Danby to ride to Milt's and get Steve, George, and Little Milt, and he tells Tom to ride to Ira's to bring back him and his two sons, Billy and Jack. She switched the number of children for each brother.
After the sheriff leaves the red paint disguised as blood on the floor to discourage jail breaks, he leaves the bucket of red paint and brush by the cell thus exposing the illusion.
When clarifying the job as sheriff, Jason says, "One-hundred fifty dollars for room and board..." instead of, "...dollars PLUS room and board..."