The color and condition of the broken club, as well as the position of it on Curly's hands, change from left to right (his hands) and dark to light (color) between shots.
When the lantern hits Pierre on the head, his hat falls off as he hits the floor, yet when he sits up, his hat is back on.
When Moe is fishing, he winds the reel when it is underneath the rod, next scene he is winding the reel when it is above the rod.
When Curly goes into the river to shoot some fish, he uses a double-barrel shotgun, but you can actually three shots emerge from the water.
Across the water a road with utility poles is visible.
When Pierre leaves the cabin after reading the note from his wife he pulls the door shut behind him but doesn't get it quite shut all the way. A moment later the door is shut completely without anyone touching it (as the cabin is supposedly empty at this time) and it is obvious a crew member pushed it shut from the inside.
Curly accidentally breaks the fishing rod when he slams it on the shore.
The trombone player accompanying the dancing girls in the saloon is clearly not playing the instrument because his lips are not close enough to it.
When Pierre returns from hunting to go inside his house, Bud Jamison's hand accidentally slips off the doorknob when he's trying to go inside.
When the Stooges escape the saloon after Pierre catches them swindling money, he fires four shots from his gun, but one shot is not heard due to a sound editing error.
When the sheriff says the line "Three sets of footprints. Maybe they're in the cabin", his mouth is not moving.
When Pierre and Curly fall onto the bed, Moe and Larry are revealed to have been under the bed but Moe and Larry never went into the Frenchman's bedroom.