Sentence examples for a grammatical error from inspiring English sources

IS there a grammatical error in the following sentence?

That would be a grammatical error, wouldn't it?

It came from the fact that the jingle allegedly contained a grammatical error.

But that does not mean that "less" is a grammatical error.

ABCD created this account only to point out a grammatical error.

A Tesco spokesman said: "I'm sorry that there's a grammatical error on our Tesco Pure Smooth Orange Juice packaging.

This is why on that October night in 1978, when Karol Wojtyla introduced himself to the world, speaking a stilted Italian, and stumbling into a delightful grammatical error while he was asking to be corrected, the inheritance of the Roman Empire seemed to us to have been lost.

Simply putting together a group of words that reads well without a single grammatical error or typo won't cut it.

Maybe a bunch of anonymous commenters decided to rage on you over a minor grammatical error on your tech blog.

There's a certain grammatical error.

And I always feel like I'm about to make a terrible grammatical error".