Two that I noticed are:

For drawings in the ghibli style, you can see noise on areas that should have all the same colour. That's because of how the diffusion model works, it's very hard for it to replicate lack of variation in colours. If fact that noise will always exist, it's just more noticeable on simple styles.

For music, specifically with Suno, it tends to use the similar sounding instruments between different tracks of the same specifispecified genres, and those sounds might change during the track and never come back to their original sound (because it generates section by section of the track from start to end, the transformer model will feed the last sections back as input to generate the new ones, amplifying possible biases in the model)