Hey, It's That Sound!: The siren/clanging bell noise used for Bonus/Super Sweep wins and the Manager's Special was first used in the second season of The $1,000,000 Chance of a Lifetime for whenever someone won the million; it was used in a few "adult"/Celebrity Double Dare pilots hosted by Bruce Jenner in 1987, and finally by Fun House whenever someone found the Power Prize (or for its spinoff College Mad House, a team finding all 13 tags in the Mad House).
Only seven ABC episodes are known to exist, all viewable at the Museum of Broadcast Communications in Chicago. One fullepisode (March 28, 1967) and two minutes from another (1966) are known to circulate.
The Lifetime/PAX version hasn't been seen since 2004, although finding episodes really isn't a problem unless you're looking for 1990 shows (which are pretty scarce... even though most fans don't mind).
Money, Dear Boy: The whole reason why Talent Associates agreed to produce the original Supermarket Sweep in the first place. At the time, the company was losing money off of Get Smart due to production issues involving the show's star, Don Adams. Among other things, Adams insisted on doing his own stunts, and while it may have looked amazing on camera, Adams would frequently get injured in the process. As a result, according to Jay Sandrich, who was the producer of Get Smart during the first season, production would often be delayed as Adams would be recuperating from his injuries. In addition, Adams was also a compulsive gambler, and whenever he would rack up debts, he would always have to take time off to do side work such as performing stand up comedy just to replenish his finances.
Old Shame: Subverted; while virtually no clips of the ABC era were seen on the Lifetime/PAX run, the rights to the ABC footage are not held by Al Howard Productions...but by HBO through their ownership of the Talent Associates library. Yes, the cable channel that brought us The Sopranos owns the original Supermarket Sweep.
Uncanceled: PAX revived the show on April 3, 2000 following nearly four solid years of repeats (Lifetime from 1995-98, PAX from 1999-2000). The show ran three more years in first-run, followed by another year of repeats before being removed entirely on March 26, 2004.
Word of God: According to Randy West, the cheeses were real, and staff got to take some home at the end of each season.