When Starlight approaches Sunburst the night before he returns to the Crystal Empire, she inadvertently discovers something about her old friend that explains a bit about their past—and present.
Dinky invites Lily Longsocks, her new fillyfriend, to celebrate Hearth's Warming with her family and friends. She just needs to tell Derpy that the two of them are more than just friends.
When Rarity woke up, she noted two things. Firstly, she saw that Pinkie was already awake, staring out of the window into the sky. And secondly, she noted the colour of said sky.