Two Rooms:

Here's a scene with Raven and Kath in full 1970s style: You have the orangey interior, circle patterned wall paper, Kath in a fluffy wide collar sheep's fur jacket.

Contrast that to Harold Hedd in his room. There's a sense of purposefulness, of gravitas, of the era lending itself some credence to the space. You really feel like you've stepped into the '70s here, which is a bit unfair since this was drawn in 1971.

In contrast Harold Hedd's got a 747 (total 70s era) with the 'button down' look suit-and-tie style as they get into their antique Model A. You get a real, palpable sense of 'us vs. them' Mr. Hedd sneaking just under the radar of 'straight' culture. He's trying, as he was all throughout the comic book, to get ahead while steering clear of getting hassled by 'the man'.

I'm sure there was a bit of that polarity in The Kitchen's world, but I didn't get the sense of it. Only a few half-hearted attempts at mimicking the 1970s, not living in it, which is my point. If you're going to depict an era of fashion/attitude/style, dive headlong deep into it and don't look back!