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Oscar Mayer/Oscar Meyer

Nope, it's not Spelled "Oscar Meyer"

MMDE: Oscar Meyer

Current: Oscar Mayer

No-one argues its not pronounced MEYer, yet it's never been spelt that way.

Even their jingle where it's spelled out in the lyrics lends itself to the change.

The famous hot dog/weiner/bologna company has been going since 1883, yet those experiencing the Mass Memory Discrepancy Effect swear it used to be spelt "Meyer".

This one could just be done to the pronunciation for people not particularly paying attention to the spelling, and this being copied by others in the same frame of mind but thinking it was correct when the saw if written down that way. 

Oskar Ferdinand Mayer

Founded by Oskar Ferdinand Mayer, the eagle eyed will have spotted there could have been another name related issue here - "Oskar" became "Oscar". 

The company has been owned by Kraft since 1989. Kraft also make Stove Top Stuffing - the subject of another well-known Mandela Effect.