As a sibling comment mentions, this is a chain-of-thought leak, in part evidenced by the excessive use of Markdown formatting symbols. In my judgement, all occurrences of noun-phrase fragments are thus better understood as either ortographic mistakes, or stylistic choices due to the language register it's trying to hit (i.e. note-taking, dictation), rather than grammar mistakes.

I do not spot any missing articles, and the missing subjects (as well as the debatable-to-be-missing transition phrases) too fall within the bounds of stylistic concern. Sentence length also.

Definitely not a pleasure to read mind you, but given that it wasn't meant to be read either, I'm not sure that should be surprising.

Sentences being too short and annoying to read is a stylistic grievance, not a grammar one. The examples were edited in after my original reply, but even then, I see no actual grammatical mistakes there.

Even with my native language, which is definitely a lot less represented in the training data, the worst I encounter are phrasing mistakes, incorrect use of idioms, and invented words. You have to use some really badly tortured local model to get an LLM to produce incorrect grammar.

I do sometimes see Opus make typos, which is entertaining, but again, not a grammar issue.