Yeah you should definitely resolve the console issues if you can.
In the case of missing scripts on some clients it can give the impression that your site is still loading/unresponsive.
The advice on seo site check-up is all quite good as well. You should have a heading hierarchy, with H1, H2, H3 etc denoting importance of content on the page. But that's getting fairly granular. Same with the css issues. Resolve them if they are critical to the end user experience, but really your priorities should be a site that loads fast and displays well on both mobile and desktop.
ಥ_ಥ - - - - - - - - - - - -ಠ_

"She was like a candle in the wind... unreliable."
Dean Learner
Trase Love:
O Mick you are so cool
More cooler than a dolphin
Let's hug me