One easy way to check is the look for JPEG artifacts that doesn’t make any sense. A lot of the systems were trained with images stored as JPEGs, so the output will have absurd amounts of JPEG artifacting that will show up in ways that make no sense for something that actually went through JPEG compression, such as having multiple grids of artifacts that don’t line up or of wildly different scales.
One easy way to check is the look for JPEG artifacts that doesn’t make any sense. A lot of the systems were trained with images stored as JPEGs, so the output will have absurd amounts of JPEG artifacting that will show up in ways that make no sense for something that actually went through JPEG compression, such as having multiple grids of artifacts that don’t line up or of wildly different scales.