MR came home and DR was not there he figured he was at friends,so i see not a thing wrong with texting mom and asking has she heard from DR instead of calling, maybe MR was thinking DR told mom by phone or text what his plans where that day?
Mark's phone call to Elaine was a hoax imo. Elaine always knew Dylan was safe because she gave him a phone to use for that purpose and soon after Dylan arrived to stay with his father, his phone was suddenly shut off and now Elaine does not know where her son is and if he is safe. JMO