This is certainly a 70s interior, but not the most 70s interior.
In the same way that the Mariana Trench remains mostly undiscovered, I don't know that anyone will ever truly plumb the depths of 70s interior design, but I can offer this as a counterpoint.
Shag carpeted walls, even all the way onto and across the ceiling.
Even Graceland has it, though these days they claim it was installed for "acoustic shielding" lol. This is the entrance to the Jungle Room at Graceland:
No, it was the style, like conversation pits and unmatched plaids and avocado or harvest green appliances.
And carpeted walls weren't in every house, but they weren't uncommon in the US as far as I know. At one point in my misspent youth, I lived in a house that had a den lined with lime green shag not just on the floor, but up and across the entirety of the far wall, while the other walls had matching green palm frond wallpaper with a chrome/mirrored background. This wallpaper visually delivered the carpet wall to you on the ricochet: even if you weren't looking at the carpet up the wall, you were looking at the carpet up the wall. It was, mercifully, a dimly lit room that did not get much light anyway.
My spouse remembers similar. It was a thing. There is a reason there are so few pictures of it left.