There was Ian McKellen's playful quip during Christopher Lee's first day of filming in the Isengard gardens. In a scene later dropped from the film, Gandalf spots a couple of orcs scuttling amongst the trees. 'Orcs?' Gandalf was to have asked in astonishment. 'Servants of the Enemy in Isengard?' To which Saruman replied, 'Not his servants - mine,' a first indication that Saruman the White was not all that he seemed.
On one take, Ian revised the line to, 'Orcs? - And so far from Auckland!'
From chapter nine of Peter Jackson: A Film-Maker's Journey, by Brian Sibley.