In general, I like the results I get from the phone's camera hardware and software. I've noticed a couple of cases where weird artefacts are added to the scene. All photos are taken in the camera app's default/auto mode. Nothing OS version: V3.5-250923-1421-EEA. Camera app version: 15.3.01.37.00
In the first example, look at the tree on the left and the brick wall on the right; they both have colourful dots like a Christmas tree:

This is not the case when the same picture was captured using S25Ultra:

In the second example, unexpected lines appear on the yellow flowers (zoomed in and took a screenshot of it):

Here is the original photo:

Have you noticed any of these weird artefacts in any of your photos?