It might have been, since it happened pretty quickly into the run -- Jim called it R2-D2 on both pilots and the first six episodes, then began calling it G2-T2 on May 2, 1978 (show 7).
To answer the OP's question, the question holder was overhauled on October 4, 1979 (show 377) which, per Jim on that show, allowed viewers to keep better track of things. The lights were originally white, becoming blue two weeks later on October 18 (show 387).
(Source: Game Show Warehouse's episode guides for
1978 and
1979, via Internet Archive.)