When Curly tries on Vernon Dent's uniform jacket in the tailor's, it has 3 sets of buttons. However, when he steps outside, it has 4 sets.
The license plate of the Stooges' fish truck says California on it, but in later shots, the license plate is seen blacked out.
The horn on Larry's hand changes positions in various shots when the Stooges are inside the fish truck.
When Curly knocks over the fishing pole with the anchor, the pole can be seen standing up in the next shot.
Larry grabs Moe's fishing pole and throws it overboard while Moe is distracted by Curley---for no apparent reason.
Moe almost slips on the boat and falls in the water in one part of the fishing sequence and ad-libs to Larry "Move over there! Move over there!"
When Curly walks to the "beach" with the girls you can clearly see it is a soundstage and not the beach.
It has barely any sand and you can clearly see the back wall.
It has barely any sand and you can clearly see the back wall.
The boat wheel can be popping loose when the dock pole hits Moe.
When Vernon Dent tries to jam the beach umbrella you can see a white earplug in Curly's ear to keep sand the out.
The Good Ice Cream cart's lettering is a mirror image.
The fish that Curly catches jump back into the water twice before jumping back in the boat.
When Curly is going to the "beach" with the girls the boom mic shadow is visible at the top of the screen on the backdrop.
When the Stooges are "out at sea", the reflection of the wooden structure surrounding the pool can be seen in the water.
The uniform that Curly tries on fits him perfectly, but when the captain is forced to wear Curly's clothes, they are way too small, despite the fact they are both the same weight size.