Peter Sellers starts out with one role and ends up with three in The Dock Brief (U.S. title Trial and Error), a satirical comedy based on the television play by John Mortimer. Sellers principal role is as an incompetent barrister assigned to defend a wife murderer (Richard Attenborough). The barristers monumental stupidity threatens to bollix the case before it begins, and indeed his client is found guilty. But ignorance is bliss in this instance; the guilty verdict is thrown out because the court feels that Sellers defense was worthless! The multiple-role bit occurs in a dream sequence, wherein both Sellers and his costar Richard Attenborough assume numerous characterizations. This was the sort of stunting revered by Peter Sellers many American fans, and detested by the actors innumerable British detractors. ~ Hal Erickson, All Movie Guide