The title is a term relating to "Button your fly."  "Fly" makes fun of the thing that caused Eddy's problem in the first place.

Edd prepares himself for spillage when he eats grapefruit.

Ed had no reaction of pain when he ran into the screen door.

Why is Rolf walking his cow?  I think he needs a dog for that kind of thing.

Eddy bangs the bell on his head.

Rolf's way of translating bells is similar to morse code.

That octopus looks funny.  My dad ate squids once....

Rolf doesn't understand what fish sticks are in American.

I wouldn't touch that sausage if it moved...

I think Edd's too inflexible for synchronized swimming.

Why is the fridge set on hot?

Heh, Eddy looks islamic wearing that blanket.

Rolf gives Eddy corn instead of a pen.  Why does he have corn in his pocket?

What the heck is Johnny doing?  And what does he mean when he says "We rescued another one"?