Before commencing with planting, roughly level the bed with a rake. In this manner, clumps and puddles are prevented from forming in the bed.
However, irregularities may even occur in the bed after planting. These, too, can be cautiously levelled between the plants using a rake. At the same time, this loosens up the earth.
While levelling the bed, stones and weeds can be simply removed and fertilisers incorporated into the soil.