A few that I can think of off the top of my head:
I called them out on the design of the roll cage in the Morrvair. The A pillars are unsupported and are going to fold down at the slightest bump. Maybe the B and C are as well, I don't remember.
I gave them grief about not having grab handles in the Morrvair. Everybody was wrapping there fingers around the bars trying to hold on.
Then just recently I asked him why the wrecker boom attachment point was welded to the rear shock mounts, and unsupported vertically.
You can go find look for yourself, but I'm willing to bet those kinds of comments get deleted. Every comment I left on hack rats videos got the axe as well.