I had a similar experience while visiting my parents recently. Sitting at the kitchen table my mom mentioned they had a small weed problem, and my initial reaction was "No, your yard is fine" because I hadn't noticed any weeds.

After saying that though, I went and walked around their yard and noticed many details I never had before. There were multiple broadleaf weeds including different phases of dandelion and some weeds I couldn't name. There were patches of bare ground and areas where the grass was unusually thick. I saw different kinds of sprinklers and also startled a rabbit while I was walking around.

I was struck, while investigating the lawn, by how before I looked at it, it existed only as a simple object in my mind "Parent's lawn". On closer inspection it has an immense amount of detail.