What’s your point, exactly?
I thought I had prefaced it with a sentence about errors and hyper-correctness.
I copied the text, missing the top sentence-paragraph, shooting my point and myself down in flames when I pasted it.
Sweet!
“Accommodate” is another one - did we do that one already?
That’s another one where I have trouble remembering how many letters. 
Smile my what on camera?
I see this so often, too. I don’t understand how it goes wrong, with other words maybe it could be hard to tell if you pronounce them the same way or there are double letters or something. I just realised why I see Americans write “make due”: you guys say “due” and “do” the same way. But “then” and “than”? They’re really, really simple words that are pronounced differently! How can this go wrong?! 
Hooked On Fuckin’ Phonics, man. Hooked On Muthafuckin’ Phonics. We’ve got people running the fuckin’ WORLD who learned to read with that shit.
It depends. If either word is spoken quickly, either because the speaker is talking fast in general or because its function in the sentence is “weak”, then they tend to be pronounced just about the same, perhaps sometimes even identically. (At least in my English. YMMV.) The vowel becomes a schwa, or disappears completely.
(It’s easy to go from a voiced dental fricative to a nasal without inserting a “vowel”. Sometimes, we even spell this fact out – e.g., “rhythm”.)
I am forever trying to spell “bizarre” with two z’s. I have yet to come up with a technique to help me remember that one. I actually had to look it up before even making this post.
I also have a bad habit of trying to insert a double-s into “occasion.” Not sure why.
“Breath” instead of “breathe.”
“Cloths” instead of “clothes.”
I am guilty of both of these as well. “Occasion” trips me up the most though.
On a tangent, but what about mispronounced non-complex words?
Skelington and nucular spring to mind.
…and there seems to be a new breed of dog where I live called a rockweiler.
I wonder how long it will be before these words start being spelled this way too, if they aren’t already?
My Oxford dictionary concurs with you. It also lists “gantlet” as "US spelling of ‘gauntlet’
There is no stanch or gantlet in English English
Esculator for escalator, perculator for percolator. I think these might be regional, but there are many people here who pronounce “hamburger” as “hammurger” and “Edmonton” as “Emmonton.”
My sister always pronounces “especially” as “exspecially.”
No one have trouble with diarrhoea? 
I just learned the other day that “nickel” is not spelled “nickle.”
Dammit! :smack: How could I forget that one?! That has to be my number one consistently misspelled, non-complex word. That word has been a menace to me as long as I can remember.
I used to give an element symbol and name spelling test to ninth graders. Three of the most often misspelled elements were sulfur (sulfer), nickel (nickle), and fluorine (flourine). Multiple ways of misspelling chlorine and phosphorus were also common.
This was after having a copy of the test in their possession for over a week.
“Manger” instead of “Manager”. Say it out loud, people; it’s three syllables. Every other letter’s a vowel. This shouldn’t be hard.