This is one set I may have to come back to as I find more among my papers. I don’t think I catalogued these but they are fascinating. They have to do with syntax, clause structure, and so forth. A few examples will give the flavor.
These are the teachers you’re going to grade their papers. – an English teacher at my school. The use of an independent clause with the possessive adjective referring back to the highlighted referent or antecedent is found in other languages but is not standard English.
Another one in this vein is, “All the New Hampshire voters who I interrupted their votes.” Gov. Richardson of NM
This is a way of solving a problem which they don’t recommend it. Roumanian math champion. I believe this would work in Spanish and I’ll get around one day to checking it for Roumanian, but it’s not English. I call this a resumptive pronoun.
“Xs are proceeded to be asked for….” The passivization of an intransitive verb carries all sorts of subtleties. This was spoken by one Dough Kmec of Pepperdine U.
One reason advanced for problems with sentences like these is, as you may have noticed, they are long sentences spoken by educated speakers. As sections of a sentence get more distant from their base, strange things happen, e.g. Do you think that because of the bad economic situation, the story has more impact than it might do otherwise (= have)” where “have” is not a verb we typically replace with “do” when it is repeated with a modal. We might call that a slippage produced by distance from the base i.e. the verb to be replaced. Since most verbs are replaced by “do” e.g. …the story exerts more impact than it might do otherwise.
Even tenses vary considerably. Here is an example from Memorial Sloan-Kettering Cancer Center, so the proof-reading is probably pretty good: “Today, Jerry is a devoted teacher (!!), which would not have been possible if he had the surgery.” I would have expected “had had” i.e. the past perfect, not the simple past.
Here is a good one from a drama teacher, standard grammar but odd, with good effect: “I had coming in every morning a parent and their student crying and moaning….”