I venture to Disneyland at least one a year. I don't drive and I have looked for the closest In and Out, I am not sure how I missed this but I thought I would share. You can take the 43 bus from Disneyland to 1180 Harbor Blvd. It's right across the street from Orangefair mall and the Disney's Character Warehouse Outlet Store. It's one bus and about 30 min away. Double Double here I come.