If she had planned that long, there would be no obvious mistakes.
Clearly, they knew their jobs and wouldn't make any obvious mistakes.
There is some obvious mistake we have made, or will make, I am certain.
It was frustrating to watch them make such obvious mistakes.
You're too good a Singer to make such an obvious mistake.
And they don't strike me as people who would make such a fairly obvious mistake.
Only 8 percent would be silent about more obvious mistakes.
So at least do yourself a favor and get someone to check your cover letter for obvious mistakes.
In a field like this, it would be an obvious mistake to forget any candidate people could live with.
In many cases, the client will ignore the obvious mistake and go for something else.