Why didn't Carl Reiner end up playing the part of Rob Petrie, as he originally intended?

Despite the character being based on Reiner's own life, network executives deemed him "too Jewish" for the part. Instead, Reiner played Alan Brady — but never showed his face, which was apparently an inside joke at his bosses' expense.

Asked by Susanna Henke · Last updated 5 years ago · 461 views · SOURCE