Never Quite As Easy As You Hope

As Bert once said in one of my favorite Sesame Street stories as a kid, "Ernie, with your one more thing and one more thing, there's no room for me in the bathtub!"
I'm feeling a little squished in the bathtub of plumbing. Our dishwasher came on Wednesday, as promised, and it didn't seem too terribly hard to hook up. We had all the parts and we saw where all the parts belonged as we had unhooked the old one for the nice people to take away. There was a slight learning curve and a greater appreciation for plumbers developed when we saw the contortions necessary to reach under the sink, behind the garbage disposal and still screw two things together with about a three inch gap to work in. And we didn't get the drain line secured quite tight enough the first time - we were scared of deforming the hose - and under the sink got very damp when we tested the set up. But we managed to figure out how tight is tight enough and when the test load of dishes came out squeaky clean for the first time in months it all seemed very much worth it.
Then I noticed a rather large puddle in the side yard yesterday.
And it didn't get smaller. Even in the bright constant sun on that side.
In fact it seemed to be getting bigger. Slowly, but bigger.
We found where the water was exiting the house - which is good - but we aren't sure why it's dripping - which is bad. Any thought? Did we damage the supply hose on the outside somehow? I really hope not. I want it to be a washer somewhere but I a pretty sure it isn't that easy.
The plumber is on his way.

This is me, afraid that it might have been cheaper to let the official guys hook it up to begin with.
**Note: Apparently we are just stupid and didn't tighten the "L" joint enough so the dishwasher leaked out and back and down the wall and the baseboards and out the side of the house. Was the floor more level it would have come out the front and we might have figured it out ourselves.