Character mistake: When asking for the address of the Blue Oyster club Proctor states it is 621, but when Mahoney arrives it states 655 on the door.
Character mistake: When Tackleberry tells Mahoney that he thinks he's in love with Kirkland, he asks Mahoney to keep it "10-35." 10-35 is radio code for backup. Since Tackleberry wants his feelings for Kirkland to be strictly between Mahoney and him, he should be telling Mahoney to keep it 10-36, the radio code for confidential information.
Suggested correction: 10 codes vary from agency to agency. Surely a fictional city can have 10 codes that don't match with whatever jurisdiction you're referencing.