It is probally a screw from a pocket of someones clothes you washed, the drain issue could be a few things, use less soap, now that they have introduced HE 2x concentration, sudsing can cause poor draining, also you may have some debris in the drain pump area, that would require removing the hoses to find out. Make sure yourdrain hose isnt pushed too far down the standpipe at the wall, could cause siphoning of the fill.