There’s just far too much artifacting there. It may look superficially sharper at a glance, but the detail it’s faking is both uncanny (look at the poor guy’s octopus arm in the lower left) and unfilmic (look at the weird gird pattern it put over everything because it confused MPEG compression for part of the scene). These problems are universal to all machine learning “AI” tools: they are not suited to restoration or archival work. Not to mention half of this plate is (a very outdated) HD scan already, so it’s not even increasing the resolution, just doing odd things to it.

If you want better-looking images, you need a better source. It’s that simple; there’s no magic shortcut you can take. I really hope Paramount greenlights a 4K restoration of this film, because that’s the only way we will get it in the quality it deserves.