Ling Woo wasn't originally intended to be a regular. David E. Kelley liked Lucy Liu so much as a guest star, he and the writer decided to reveal that she has a law degree and join the firm after a few episodes, giving her a reason to be there.
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In "Love is All Around" a part of the scene where Todd (Guest Star Matthew Perry) accidentally hits Ally on the head with the bathroom stall door was cut out. The part that was not shown was after he hits her Clare pops out of another stall and accidentally pushes Ally with the stall door into Todd's arms. Embarassed by the situation she asks Todd to let her go but when he does she drops to the floor.