 The scene that was meant to be the opening is cut in half and    moved around. In the final cut, the first half of this scene    (which depicts Caligula worrying to Drusilla about Tiberius    killing him) occurs between Caligulas tour of the grotto and    Nervas suicide. The second half of the scene (where Caligula and    Drusilla fool around and are caught by Macro) now immediately    follows the opening credits.  