Quite unusually for this series, the first two parts of the story had their worldwide debut not in the ongoing American comic series, but in its UK sister series Doctor Who: Tales from the TARDIS, appearing in the first and second issues of its third year, less than a week before their respective American printings. Regardless, the fine print on the issues' contents pages still credit 13DY2 1 and 13DY2 2 as their original printings.
This is the first Titan Comics story to make its debut in the UK before the US, at least as far as parts one and two are concerned.
Despite evidence to suggest a setting after Spyfall, the TARDIS interior uses its series 11 design.
While in 1969, the Thirteenth Doctor says the Weeping Angels are "22 years away", which would be 1991. Despite this apparent mistake from the writer, she mentions the correct year of 2007 on the previous page.
The Thirteenth Doctor expresses her appreciation for Janice's ginger hair, saying that she had thought about going ginger herself. Likewise, the Tenth Doctor, upon meeting his future self, expresses his disappointment that she isn't ginger. (TV: The Christmas Invasion, The End of Time)
Ryan questions why the Thirteenth Doctor cannot simply remember what is about to happen to her past self. The Doctor tells him that memory flows very differently when crossing ones own time stream. (TV: The Day of the Doctor)
The Thirteenth Doctor assures Martha that her and the Tenth Doctor do eventually get their TARDIS back using Sally Sparrow's notes, (TV: Blink) and that Martha goes on to live past her travels with the Doctor. (TV: Last of the Time Lords, et al.)
When first encountering a Weeping Angel, the Tenth Doctor tells Ryan, Graham, and Yaz, "whatever you do... don't blink". (TV: Blink)