Best advice is to talk with an agent. Here, everything is negotiable from the closing costs and prepaids to reimbursement for home inspections and in some cases, using extra closing costs to pay off the buyers credit card or auto loan debt. Here, closing costs are different from prepaids (insurance, taxes, hoa, etc) and both are different from 'allowable expenses' like inspections. As long as they are addressed in the contract and 'as authorized by lender' there can be a variety of items.
Not sure what's a go in CA but a good agent will help you figure out what you are and are not allowed to put in. Good luck!