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I'll post a single simple anecdote, but this is much much worse.
https://github.com/GEOS-ESM/GEOSgcm_GridComp/blob/develop/GE...
Line 87, you can see they copy physical constants from an old physics book and then later they commented out and used different constants. You can see that the difference is quite significant.
The cloud physics code there I saw in different models, with different "constants", with other comments also taken from physics books as old as the 1980s. Can look in general at the accuracy of physical constants used, some of them aren't constants at all (and depends on composition of air INCLUDING CO2, such as gas constants). There are also much more complex problems there that I can't explain over a single post.
This is extremely complex to evaluate the impact of everything going on there, and I can't make claims that it should go one way or the other, but the code quality and the testing done there are definitely not enough to reach the conclusions made and the trillions of dollars worth of decisions that followed.