Factual error: During Globo Gym's commercial at the start of the movie, White shows a picture of himself as an obese man in 1987 and indicates that was him 6 years prior. However in the same commercial, you can see a woman grab a bottle of Vitamin Water from a likewise branded fridge. Vitamin Water did not exist in 1993. In fact, its parent company Glaceau was not founded until 1996.
Other mistake: Peter took the $100,000 bribe White gave him and turned it into $5,000,000 by betting on his team. He did this, so he could buy enough shares of Global Gym stock and take over the company, and in the process kick out White as the CEO. The problem is $5 million wouldn't be near enough to gain control of the company, to be public its value would have to be at least in the tens of millions.
Continuity mistake: During the tournament when it's just Gordon versus the entire other team, the background advertisements change multiple times. The problem is, they appear to be hung there, not electronic.
Answer: It's just a random guy in the bleachers, his hair is too light, and he is at least 20 years younger than David Hasselhoff.