Alliterative names and comic books go hand in hand. DC has Clark Kent, Lois Lane, Lex Luthor, Billy Batson, Wonder Woman, et al. And the legendary Stan Lee was a fan of the practice too, with heroes like Sue Storm, Matt Murdock, Bruce Banner, and the unforgettable Spider-Man himself, Peter Palmer. Wait. What?
It's true. In Spidey's very first solo book, 1963's The Amazing Spider-Man #1, Stan Lee misnamed the Friendly Neighborhood Spider-Man as Peter Palmer instead of Parker. Not only that, he did it not once, not twice, but three times in the story Spider-Man Vs. the Chameleon! But what's curious, is that this gaff happened in the second story of the book. The issue's first story, simply titled Spider-Man, correctly identifies the character with his proper spelling at least five times.
Before his passing, Lee had gone on record admitting that his memory was terrible and that he found the alliteration as an easy way to recall his characters' names:
"So I finally figured out, if I could give somebody a name, where the last name and the first name begin with the same letter, like Peter Parker, Bruce Banner, Matt Murdock, then if I could remember one name, it gave me a clue what the other one was, I knew it would begin with the same letter."
And in Lee's defense, he was right that the technique helped him remember the first letter. It was just the rest of the name he could have used a similar trick for. Also, neither artist Steve Ditko or letterer John Duffi - not to mention the book's editors - picked up on the mistake either.
It's also worth remembering this is Spider-Man's first solo book and only his second appearance ever, following his debut in (Amazing Fantasy #15) so Peter Parker wasn't the household name that he is today. Also, mistakes like these aren't terribly uncommon. Frank Miller's Daredevil #168 misspelled Elektra's name (as Elecktra) right on the cover of her debut issue and Action Comics #598 apparently forgot where Superman lives, with its cover saying he calls "Metroplis" home. But it's still funny to consider nobody caught the mistake, especially when he would go on to be one of Marvel's flagship characters. And it's not exclusive to comics, either. You can find similar missteps in the MCU as well.
At the end of the day, nobody is perfect - not even Stan "The Man" Lee - and mistakes happen, meaning this is just a silly footnote in comic history. Even with his alliteration trick, brain farts are bound to happen. So Stan slightly slipped scripting Spider-Man's secret. Sorry, supporters. Stan's Spidey Senses simply seemed somewhat subdued.