Edward Solis is one of the few actors to appear in all three movies. In the comics, the Detective is a close confidant of Paula, and they work together on several stories, but comes to a tragic end in Paula Peril Issue 8 'The Deadly Price'.
In the Gazette scene, there are a number of newspapers framed and placed on the wall. These props were first used in 'The Invisible Evil' (2010), but appear in most subsequent films, including 'Midnight Whistle' and 'The Adventures of Paula Peril'.
The final peril scene was filmed in two different locations: one for poolside dialogue, and a second for the underwater stunts. The second location was needed because deeper water was required for actress Valerie Perez to remain below the surface while chained to a cinder block. This entire sequence was filmed in two nights, but required several weeks of planning by trained professionals.