It also seems that whoever created this kind of gave up when figuring out Canadian speech patterns spanning longitude from east to west. Somebody from Kenora or Dryden or Timmins Ontario does not speak like a person from North Vancouver, BC. Vancouver region English is much closer to general west coast as it's spoken in a big city in WA, OR or California.
I'm not an expert on accents or anything but I think you can hear it in "dinner". Boston is the typical "R's don't exist" thing. Maine is more like "dinnyah" - your jaw kicks back a bit.
In southern Maine, the accent is moderate and is more of a general northern New England accent. Yahd = yard, that kind of thing.
The iconic Maine accent is the Downeast accent and is still kicking up/down there. It's kind of nasally and has a lilt to it. You have to dig through a morass of influencer content on youtube to find an authentic example of it, but this is a good one: https://www.youtube.com/watch?v=FZDpx1aLovc
But there are a number of different accents throughout Maine. My favorite without a doubt is the accent in way northern Maine, from the Allagash Valley. It's just a pleasant accent. This is a good example: https://soundcloud.com/mpbn/troy-jackson-allagash-logging