The $5000 used on the show used 5 genuine $1000 bills printed especially for them by the United States Bureau of Printing and Engraving since at the time they printed no denominations over $100.
'Patrick O'Neal' was the voice of the Intersweep Bank executive who we see in the opening credits handing Patrick Flaherty his list of "million plus winners" and explaining the rules of awarding the winnings.