intentionally!!!!!
Most of people put correct name / enter all details in data of birth and selected checkbox that is called mistake .
Mistake will corrected . That’s all .
You cannot put weight on mistake like this is big mistake and other is small mistake .
Many people don’t know what they put as no chance or time to review it.
Mistake will be corrected that’s it.
If they put name and selected check box
That means they were in rush, ok. May be that could be accepted.
What about putting “calgary” when the name is “toronto”
If a form is full of mistakes, and They accept it with explanations, they will be contradicting their own statement that advised people to READ carefully the form. And it will be unfair for people who double checked everything and lost extra time and moreover some people even lost chance to submit the form just because they checked everything twice.
What they meant by you can submit correct information later with “proof of changes” , i think that is if you change your name or address in between the form submission and application.
But also they might accept few other mistakes, as country of residence, by mistake people selected their home countries.
May be a digit here and there in DOB.
Some typo mistake in name etc.
Its totally upto IRCC what they consider is a mistake.
But if someone just put everything wrong and just a couple of things right, I don’t know if they will accept explanations for that.
Well, Lets not argue and not be firm on “our speculations” by saying this is going to happen and thats it.
IRCC knows better how will they handle it.!
Good Luck.