The gaps aren’t I assume the nail holes will be filled, sanded and painted.

Oh that is unfortunate what has been done. Do not pay for that, and try to get a carpenter that knows how to do it right. The wood used isn’t even nice looking. Sorry this happened.

I think the "carpenter" left his measuring tape at home.

That would be HS level skill

I think the measuring tape left his "carpenter" at home.

Wow.....the sad state of professionals these days. Who did this work? And how thick were the glasses.

Do-over.

If this is what "pros" do it makes me feel much better about my DIY skills. Looks like he left his board stretcher at home.

The carpenter just didn't care.

"We had a guy who was really recommended to us through family"

I always advise never ever to do any renovation work with family or friends, or take recommendations from family or friends. No matter what. The family/friends usually know no better than you do, and the recommendations are based on friendship, drinking buddy, being neighbors, high school classmate, or similar, not skills and abilities. Plus you may have ruined your relationship with the person who made the recommendation because it did not turn out well. Happens time and time again.

Terrible job. It needs to be redone. Pretty sure your parents would be very unhappy with that mess.

Thank you everyone for the input. I’m uncertain whether or not to allow the trim installer to ”fix” anything or eat the mistake and cost.

No offense...but please don't call the persons responsible for that abomination a "carpenter"

" I’m uncertain whether or not to allow the trim installer to ”fix” anything or eat the mistake and cost. "

If he thinks that is acceptable work, I would very much hesitate on how he could possibly "fix" it. I would cut your losses now and move on from this "carpenter".

I once got a glowing recommendation from two people who said that the guy could "take a sketch from a napkin and build what you want from it".

It turns out that's what he could do. If you had a vague sketch and general idea of what you wanted, he could build something. If you had exact plans of how something was actually supposed to be built and expected it to be built accordingly, forget it.

The problem with referrals from friends is that they may have exceedingly low standards.

If the same individual would be coming back, I have my doubts. That said, without getting into all of the legal ramifications, it would be best to give him one chance to fix. After that, its one of those "fool me one time, fool me twice" scenarios.

"You can't get fooled again!"

-G.W. Bush