What do these episodes have in common?

Beaver's Guest -Larry stays overnight

Found Money

Beaver's Dance- Beaver and Larry go to dancing school

Beaver Takes a Bath

Larry Hides Out

Is it that Madge Blake is in all of them?

Close enough. Mrs. Mondello drops by the Cleavers house in all of them. "Where in the stomach?"

Yes, Mrs. Mondello's (we never got her first name, did we?) line after Larry had stayed overnight.

BTW, in an episode the other day, Larry mentioned a little brother. Other than his mother and a brief glimpse of his dad, we never saw any other members of Larry's family.

No we didn't but heard a lot about his boy crazy sister and older married brother.

"But they're soaking wet!"
"Oh Larry why do always do these things when your father's out of town?"
"That's Larry's suitcase and it's going up in the air!"
Larry- No I didn't have to take a bath but had to change my underwear." "Oh Larry!"
"My daughter drove me over but her hair's up in curlers!"
"Larry we don't want to wear out our welcome."
"Larry I wish you would stop saying the money fell out of an airplane."
"Mr. Cleaver have you ever heard anything like that before?"