If info on my traffic ticket is inaccurate, when to I bring it up? Is it grounds for dismissal?

Unless he wrote you for an expired registration plate this error would have no bearing on your citation and would not make a difference in the charge. You can bring it up in court but minor errors (especially ones that have absolutely nothing to do with the charge) are not normally grounds for dismissing the case. The court personnel might get a much needed moment of levity out of this but it probable won't be a Perry Mason moment for you.