In the first episode of the first season I spotted a red LUNNA chair (discontinued). It disappears for a while after George tears up the living room but it shows up again a couple of episodes later.
After most of their furniture was destroyed, Mitchell did say "I'm sensing a trip to IKEA. And you know my feelings on that". Considering that the new furniture wasn't IKEA, it looks like Mitchell managed to avoid a trip to IKEA.
They did have several colors of DINERA mugs.
In Owen's apartment, episodes 3 and 5, there is a FRÄCK mirror in the bathroom -
and STOCKHOLM CIRKEL cushions (
I don't know if I will continue watching the 2nd and 3rd seasons. I wasn't as engaged as I hoped to be but I liked the concept of them trying to be human.