The part that he has to buy a house to get out of the motel pretends there aren't any other motels in town. Um, how about Holiday Inn for two weeks.
And his mom blames Rick Carver, not the bank that foreclosed seems misplaced.
just to also add having watched it again, I get that it's done for dramatic purposes and for the mother/grandma to find out that Dennis has been working for Rick Carver, but I find it hard to believe that ginger beard would recognise Nash as instantly as he does. In casual clothes, wearing a baseball cap and with his back turned before ginger beard's even looked out of his car window.
Also, during that montage of evictions that Nash does, you'd think they'd have shown ginger beard's family being one of them, just so the viewer will think "uh-oh" at the same time as Dennis when their car pulls into the motel.
Or better still, have Dennis not even see that family arrive and bump into ginger beard in the walkway of the motel one morning - ginger beard would create enough of a scene and enough noise that Dennis' mum would hear and find out what had been going on.