Another good way to check is look for JPEG compression artifacts. A lot of these systems stored the images for training as JPEGs and thus they’ve been trained to add JPEG artifacts. They also were not corrected on what JPEG artifacts should look like, so they’ll add nonsense artifacts where they wouldn’t normally show up, for example, places without high contrast or that don’t line up with the grid that artifacts tend to form.
Another good way to check is look for JPEG compression artifacts. A lot of these systems stored the images for training as JPEGs and thus they’ve been trained to add JPEG artifacts. They also were not corrected on what JPEG artifacts should look like, so they’ll add nonsense artifacts where they wouldn’t normally show up, for example, places without high contrast or that don’t line up with the grid that artifacts tend to form.