Maude : Vivian’s surprise - Arthur’s twin

Vivian’s surprise - Arthur’s twin

A fun episode, but who doesn’t tell their spouse that they have a crazy twin brother?

Also, notice that Conrad Bain plays both Arthur and Arnold until the last scene, the only time both characters are onscreen together. Then, Bain’s twin brother plays Arnold and only says a few words. Because it’s clear as soon as he opens his mouth that he isn’t Conrad Bain - they sound very different. And if they had had him play Arnold throughout the whole episode, it would have been implausible that Vivian couldn’t tell them apart.
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