Moe's hair changes from dry to wet between shots when Larry accidentally hits him with the kitchen door.
Shemp's hair changes from messy to neat when Moe is reading the letter from Bill.
The side of the feather duster being pulled moves, but the other side does not, even though they are supposed to be connected.
The antenna tips over to the side when Shemp puts it down on the roof.
The phone accidentally falls off the table when Moe tries to pick it up while ringing.
Obvious dummy used in the scene where Shemp falls through the roof and onto the TV set.
Jules White can be heard saying "Go ahead." after Moe goes into the kitchen to make another sandwich. This was the cue for the cameraman to cut to Shemp's foot slipping on the soap.
When Moe is working on the wall plug and he shorts it out and is supposedly getting electrocuted; he is holding on to the wooden handle of the screw driver. He should have been completely safe.
When Shemp says he should nail the antenna to the roof, his mouth is not moving.
When Shemp says "Moe. Where did Moe go?", it is clear that it was dubbed in as it does not match his mouth moving.
Obvious cigar used as the end of the feather duster sticking out of Shemp's ear.