86 said
Anyone notice in the song "The Stalker" on Beverley Killz that J mentions Jiffy peanut butter. But Jiffy doesn't exist. Point being was the Mandela Effect even that well known back when Beverley Killz came out? Or did Jiffy peanut butter exist at one point?  

Like many people who also "remember" that is was once "Jiffy", I think J's brain misfired. 

"Choosy Moms Choose JIF" is what I always remember and I am close to 50 years old. I never remember it ever being called "Jiffy". 

Now there was also an ad campaign before that. It's promotion was that JIF peanut butter was an easy meal that can be done '"n a JIF-fy."

The name's similarities with Jiffy Popcorn, Jiffy Lube, or even Skippy Peanut Butter may also lend to the confusion.

Mandela Effect seems, to me, to be nothing more than a psychological phenomenon caused by the way the brain stores memories and connects these to elements that have similarities. No alternate histories, parallel universes, or time traveling people changing the past - Just simple memory mis-association.