StCoop wrote:

So looks they swapped the running order of the last two episodes around, as we see Rory losing his phone charger in Henry VIII's bedroom this week after it being referred to it last week. (It also explains why there was no "Picking up the Ponds" scene in that episode.)
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There's also the theory floating out there that "A Town Called Mercy" happens
during the wedding anniversary party in this episode.