The picture that Sam is drawing in the beginning of the episode is a picture of him tied to a tree and walkers coming after him. This references what Carol said to him in a previous episode.
When tending to Carol's wounds, Morgan tells her to "Sit down, before you fall down." These are the same words he said to a wounded Rick in the series premiere. He also says the same thing to Eastman in the cemetery towards the end of 'Here's Not Here'.
The four small figures in Sam's (Major Dodson) room at the beginning are from Robert Kirkman's 'Invincible' comic.
Though there was a post-credits scene, many of those who watched the episode live or recorded the episode on first run did not get to see the scene because it was shown during the commercial break of Into the Badlands (2015). The scene does appear after the credits on any digital download.