The late comedians livewire performance was sometimes filmed on four cameras simultaneously, says director Chris Columbus.
Robin Williamshas always been known for his brilliant ad-libbing talents and a new interview withMrs.
DoubtfiredirectorChris Columbusrevealed the mind-boggling extensiveness of his improvisation.

Robin Williams in ‘Mrs. Doubtfire’.20th Century Fox / Everett
Thats equivalent to roughly 379 miles further than the distance between Los Angeles and San Francisco.
Columbus recalled Williams spur-of-the-moment style.
By saying that, what he meant was he wanted to improvise.
And that’s exactly how we shot every scene.
Robin would change every take.
We would go to the script supervisor and ask her and sometimes she didn’t even get it all.
Often, he would literally give us a completely different take than what we did doing the written takes.
Williams livewire performance could only be contained by technical limitations.
If it were today, we would never end, Columbus continued.
That happened on several occasions.
Columbus also said that he hopes a documentary onMrs.
We want to show Robin’s process.
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