Arnold didn't support 73. He emphasized only 74 through 77. Look at every mailer that he sent out.
Not true. He endorsed Prop 73 on John & Ken's show on KFI. And also on Roger Hedgcock's show on KOGO. And probably on Rick Robert's show on KFMB-AM. He even threatened to beat up anyone who would take his daughter for an abortion without his knowledge.