The shading of the mud on Rosita's face changes from light to dark between shots.
The unconscious dog is laying on the ground in a different position when Curly says the line "Tarpon Monoxide".
The paint stains on Curly's face when he sprays it disappear in the next shot.
The position of Larry in the driver's seat of the fish truck changes when Moe and Curly are shouting "Fish!".
A rounded object magically appears on Curly's head when Moe smashes the hardened mud off Rosita's face.
When the Stooges exit the fish truck, Curly is supposed to put the horn he is holding in his pocket, but forgets to put it in the whole way.
When the Stooges drive their truck into Cucaracha, tire tracks can be seen in the dirt from previous takes, before they arrive at the beauty
salon.
When the Stooges arrive at their new business it clearly says Beauty Salon on a sign on the building yet the Stooges seem surprised and angry after entering the building that they were swindled and bought a beauty salon.