Should have been a "nothing" on that one. The rule does say that finger pointing is a foul, but only if it's toward an opponent.
On the other hand, Quentin70, you're a bit mistaken. Your examples of Drew Pearson, Jerry Rice, Tim Brown, Emmit Smith are all true - except that the NFL has very different rules regarding celebrations than the NCAA/Texas UIL. In fact, the NFL rules have changed significantly since those guys crossed the goal line.
And finally, we should all remember that the rules are made by the coaches, not the officials. We only enforce the book. I'm sure the coach on the opposing team would have been furious if the foul was not called.