When the boys are in bed and Ward comes up to speak to Wally, Beaver's bedding keeps changing positions. In some shots the sheets and blanket completely cover his neck, while in others they're down several inches, exposing the upper part of his pajama top.
In the boy's bedroom after Wally places his adjustment device on his nose, he tells Beaver to turn off the light. Beaver reaches for the switch which is already down in the off position. He swipes his hand downward over the switch as the switch remains in the down, off position, but the light turns off anyway.
Wally says that Lumpy has been a sophomore for two years, but earlier this season, in The Lost Watch (1958), Wally says that Lumpy is a junior in high school.