Marty Glickman was once a fixture announcing Giant games and, later on, HS Football Game of the Week. We all loved him.
But he did have this one little problem with math:
He'd announce that an offense gained 8 yards on 1st & 10 and then, somehow, the next down would turn out to be 2nd & 6. It used to drive me nuts.
That plus Frank Gifford (who was terrible at first names) always referring to every player as "Ron."
And before I forget - The late Howard Cosell was a known hero worshiper (not only of Muhammed Ali but also) of the Dallas Cowboys. During one Cowboy-Cardinal MNF contest (with virtually every word coming out of Howard's mouth bragging about Americaa's Team), the Cardinals built up something like a 37 - 0 lead over the first two quarters (and, apparently, with every additional Cardinal point, Cosell got tipsier and tipsier). When it came time to announce the beginning of the 2H, it was either Dandy Don or the Giffor who came on the air with the solemn announcement that "Howard isn't feeling very well right now and won't be with us for the second half..." (Heh heh heh).