Superman Returns - and knows nothing of probate

Last night I spent 2-1/2 hours (!) watching Superman Returns on DVD.  I knew I was in trouble from the opening scene, in which Lex Luthor (played by Kevin Spacey) apparently inherits a bunch of property from a wealthy older woman by having her sign a new Will -- with Luthor as the only witness -- just seconds before her (suspicious) death.  I suppose it's interesting that the older woman was played by Noel Neill (Lois Lane in the old TV series "Adventures of Superman"), but I really just felt like I was in Bizarro World -- would any court in Metropolis really uphold a Will executed under those circumstances?