When Gabriel is talking to McClane over the phone and pulling up his information on the computer, Bonnie Bedelia makes a cameo appearance in the form of her character Holly McClane's driver's license photo. The photo appears as though it may be either a publicity shot from a prior [Die Hard] film or a still photo (i.e. family portrait) from one of the movies.
Bruce Willis has openly stated he would like to bring back Bonnie Bedelia to the series. She originally played the character of Holly Gennaro McClane, the wife of Bruce Willis' character John McClane in the firsttwo films of the [Die Hard] series, but didn't appear in the lasttwo.