Theory:Doctor Who television discontinuity and plot holes/Spyfall

You are exploring the Discontinuity Index, a place where any details or rumours about unreleased stories are forbidden.
Please discuss only those whole stories which have already been released, and obey our spoiler policy.

This page is for discussing the ways in which Spyfall doesn't fit well with other DWU narratives. You can also talk about the plot holes that render its own, internal narrative confusing.

Remember, this is a forum, so civil discussion is encouraged. However, please do not sign your posts. Also, keep all posts about the same continuity error under the same bullet point. You can add a new point by typing:

* This is point one.
::This is a counter-argument to point one.
:::This is a counter-argument to the counter-argument above
* This is point two.
::Explanation of point two.
::Further discussion and query of point two.

... and so on. 

• The Master says he took a trip home to Gallifrey in its "bubble universe," although it is established in Hell Bent that Gallifrey became unfrozen from another dimension and returned to the real universe, though at the extreme end of the time continuum.

It is unclear if the Master was aware of it becoming unfrozen so as far as he's concerned, it was still in a bubble universe.

Since he was taken back to the last day of the Time War in The End of Time, he was there when it was frozen and later unfrozen, and thus he knew the planet's status & location before getting a new TARDIS and being "kicked out," information backed up in The Doctor Falls.

It may have been returned to its 'bubble universe' afterwards. Or the Master may simply be referring to its former state. Or - as I think - he may have gone there when it was still hidden, perhaps through a confession dial? Did anyone notice that the device he used to send the Doctor his message looked awfully like one? Perhaps he was also asked about the Hybrid. Would make sense.

• Why does O look like the Master, and why does the Master look like O?