Recently, Collider got to help celebrate the 15th anniversary of Constantine by hosting a Comic-Con@Home panel with star Keanu Reeves, director Francis Lawrence, and producer Akiva Goldsman. During the hour-long discussion, a number of different topics about the occult horror comic book film were discussed, including how it managed to receive an R rating despite not really featuring the kind of gore, nudity, and language that usually provokes one. Lawrence revealed that the production had deliberately set out to make Constantine a PG-13 movie from the very beginning, and were surprised to learn they’d been …