No. This is not a mistake. However, there are certain instances when you must attach copies of your W2s.
If you see the W-2 listed on the "Wage and Tax Statement" within the CA 540NR form, this fulfills the reporting requirement and there is no need to add the W-2 copies. Attaching copies in this instance is not advised by the Franchise Tax Board as it could slow down the processing of your return.
