NEW YORK (TheStreet) --CNBC's Bob Pisani joined Friday afternoon's "Closing Bell" anchor Mike Santelli on the floor of the New York Stock Exchange to discuss the trends characterizing Friday's trading session.

"This happened several times this week where we start strong and end towards the lows of the day. We had a little bit of excitement during the middle of the day on Apple,  (AAPL) - Get Reportand Apple's volume was below normal until about 1:20 EDT," Pisani noted.

The excitement was caused by reports from a company called GfK, a German market research institute, that said the iPhone 7 sales might be weaker than expected.

"We contacted the company and said their findings are based on a point of sale data in 17 countries during the launch weekend. They would not confirm what the contents of this report was," Pisani said.

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As he concluded his report, he made mention that investors should be keen to the Mexican peso's reaction to Monday's U.S. presidential debate.

The Dow Jones, S&P 500, and NASDAQ all closed lower on Friday.

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