Factual error: Adam Sandler is cooking bacon on the bug zapper, laying the meat on the outside cage. That couldn't happen, since the outside of a bug zapper is not hot and has a covered protection cage to avoid shock. (The cage is what the bacon was lying on.)
Factual error: The championship game was in 1978. Thirty years later, in 2008, the coach dies. Lenny rents the lake house for the three-day Fourth-of-July weekend. In 2008, the fourth of July fell on a Friday, not on a Monday as depicted in the movie.
Answer: Yes. It shows his age and another portion of his life that he's covering up. He makes mention of his toupee later in the film.