The support is attached to the end of the broom, it makes a loop down to a base with "Surrender Dorothy" painted on it.
You can tell that some of the sculptures have to do with the inhabitants of the houses, while others are pop culture icons.
The one above is a ratfink (see under Big Daddy Roth) , I believe.
The name of the boat is "Florence".
Finally, the front yard of the artists themselves. As my nephew and were on our return journey down the other side of the street, the man himself passed us and waved.