Late reply but here you go! OC is pretty easy going, they wont stop you for tint or lack of front plate, etc but if you are speeding and get pissy with them, they might consider adding those things to the ticket
Highway Patrol, is a hit or miss. Depends on the day so no matter whether OC or LA, they might get you for tint.
LA and especially LAX Airport area, very touchy on tint and front plate. Hit or miss but much more likely up there than here in OC. In 10 years, LA got me twice, once for tint and once for plate. OC, never once.