On last night’s Doctor Who Christmas Special, amongst all the sentimentality, there was some really important information divulged. What are the things that fans should remember?

Steven Moffat promised a Christmas episode that would require tissues and be filled with sentimentality. Now whether or not he succeeded in doing that is debatable. Nonetheless, some important information was revealed that fans should keep in mind for future plot lines:

What do you think about these facts? How would you rate last night’s episode?