Etiquette for providing manuscript /poster feedback
Your job as a reviewer is to help improve the work, and so any suggestions that make it a better submission are fair game.

I would not hesitate to comment on any of these areas, as long as you are sure the suggestions are really an improvement (and not just a different opinion about style). The formatting inconsistencies you give as examples are certainly real issues that are work fixing.

For these small changes, fixing it yourself with tracked changes rather than suggesting it is usually more helpful.