Yes, you can mail an Informal Discovery Request to the police agency that issued the citation, Attn. Custodian of Records. Request specifically the copy of the reverse side of the citation. One format you can use is here . Or you can get from Amazon the excellent book "Fight Your Ticket and Win in California" by David Brown.
Also, officers often write on the reverse side of citation in a shothand code meant to repel ticket warriors like yourself. Feel free to upload it here if you need help deciphering.

