I don't think it can be a continuity error. There are too many in various episodes. So TPTB are either getting very, very careless or something peculiar is going on with time - almost as if someone is re-arranging the timeline.
Also did anyone else notice the symbol on River's jacket and on the sphygmomanometer?
The Omega perhaps?
Also did anyone else notice the symbol on River's jacket and on the sphygmomanometer?
Spoiler:
The Omega perhaps?
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