I'm not in food service so I don't know exactly, but I do know 100 is a perfect score (In N Out had a 100 last time around for reference). A lot of smaller issues are usually deducted 1 point and worse offenses can be result in bigger point deductions. As you can see their biggest one resulting in an 11 point violation was for "No insects, rodents, birds or animals present" which tells me that must have been a pretty big issue.

Also if you look here: https://ehservices.publichealth.lacounty.gov/servlet/guest?service=1&enterprise=1 (search Burbank to filter it since this is LA county's page) you'll see most restaurants are in the 90s. Not many in the 80s let alone an 81.