Warning: There are spoilers ahead for Sunday's episode of "The Walking Dead," "Warning Signs."The mystery of the missing Saviors may have come to an end on Sunday's episode of "The Walking Dead," but a larger war may be brewing up underneath the surface between Rick and Maggie. The two have very different ways of dealing with problems in their respective communities.Plus, Father Gabriel looks like he's going to get whisked away by Anne on that mystery helicopter. From the Oceanside men to another look at Hershel's watch, there were a lot of nods to previous seasons this week.Keep reading to see what you may have missed.Sunday's opening of "The Walking Dead" teases a threatening sign, "Final Warning."As Justin reanimates into one of the undead, pay attention to the screen and you'll notice the ominous message.After watching the episode, itseems to be a message to the Saviors from the Oceanside women. There were also some thoughts this may be a message from upcoming villains, The Whisperers.If you've been watching the season closely, this isn't the first time we've seen this message.You can see the same message very briefly on the show's new opening credits.Showrunner Angela Kang said there are a lot of callbacks and Easter eggs waiting to be found in the new opening. Not all of them are nods to past events on the show like Carl and Glenn's death.The noose hanging from the barn and the words "Final Warning" all hinted at moments to come on season nine.It's also worth noting that we've seen writing on walls like this before on the show. During season five when the group went back to Noah's community, a warning sign could briefly be seen behind Michonne saying, "Wolves Not Far." That sign teased the eventual introduction of a gruesome group who referred to themselves as the Wolves, who attacked Alexandria.Rick heads down the stairs at the episode's start and touches a panel with two handprints.Did your eyes tear up as you realized Rick took the old deck from his house at Alexandria with his children's handprints and hung it up on a wall'Carl spent his good last day making sure that he spent some time with his little sister before saying goodbye to Michonne and Rick.The entire scene with Rick is even more emotional when you think about how he was going from room to room checking in on all of his loved ones before he began the day. Carl was the last one he passed before starting his day.See the rest of the story at Business Insider Click here to read full news..