That said, one that's burned into my brain is when they're walking along the South Bank riverside; the episode is apparently called "Ice Cream". The shot at ~0:48 in this video: https://youtu.be/cBti7aQBMk4?si=o3sWwfKJwQ-VEa8e&t=48 Is approximately from here: https://maps.app.goo.gl/Y1UmtCK5si8drVaD7 - It's not exactly the same as the show, but that's more a limitation of Google Maps; I bet you could recreate the shot. There's also usually an ice cream vendor just about there. :)
The bridge in the background is Victoria Bridge, the clock on the right is the Suncorp building (I think now demolished), the weird multi-part building next to it is Brisbane Square Library (now also a Suncorp building), and the arched building to the right of that is the Treasury Building (formerly the casino).
The rest of the shots in that episode are from various other parts in the parklands if you walk along it, including the lagoon beach, fountains, and walkway. The whole area (and the ibises) are an iconic part of Brisbane, as a legacy of Expo 88.
Aside from that, I think quite a lot of the shots in the city take place in real places, whether recognisable places like Mt Coot-Tha or random shops in the suburbs.