The use of Suk as Joy's surname is incorrect. Her father's name, according to the back of the photo, is Kim Huh Suk. Therefore, the family's surname is Kim. Both Korea's give a person's name with the surname first.
Mannix is pursuing the man in the stocking mask through a warehouse for theatrical props when the man pauses between two mirrors and fires back at Mannix, breaking one of them. The chase continues until he pauses between another set of mirrors and again fires, breaking another mirror. The pattern of the broken glass in each scene, however, reveals that the producers reused the same shot of the mirror breaking, but tried to make it appear that they were different incidents by using shots from different angles.
When Mannix is chasing the man in the theatrical warehouse he fires at least 11 shots from his revolver, which only holds 6 rounds.