A probably unintentional one, but it's mentioned that previous owners of the Jade Dragon all met early demises due to the fact it was made of kryptonite and the radiation coming from it. Years later in Justice League we find out Luthor held a small piece of kryptonite for years to keep Superman at bay and caught a terminal illness from it. (Then again, the latter was a plotline that had already played out in the comics...)

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