https://www.metv.com/stories/rob-reiner-used-to-take-off-his-toupee-to-avoid-being-recognized-by-all-in-the-family-fans

Reiner had a pretty effective way to disguise himself from the public.

Even the very most casual AITF fan knows that Reiner wore wigs on the series. Who is supposed to be surprised that he ditched them when not on-camera? This is really weak material.

Even the very most casual AITF fan knows that Reiner wore wigs on the series. Who is supposed to be surprised that he ditched them when not on-camera? This is really weak material.
He did not start wearing a hair piece until the second season. He did not want to but the network insisted. So believe it or not many did not know for awhile.