Corrected entry: When the weasels break through the wall into Toontown, one of them pulls out a brick and says "Toontown is on the other side of the wall, boss." When he says this, he lets the brick go, and it continues to float in mid-air above the hole.
JC Fernandez
15th Oct 2007
Correction: This is by design and plays upon the long history of cartoon characters breaking the laws of physics for comical effect.