These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Doctor Who S32 E13 "The Wedding of River Song"
In previous episodes featuring the Silents, we'd often see the interaction with them before the character turned away and forgot about it. This time around, we see mounting evidence between cuts that they have been dealing with them repeatedly during a single scene (the Doctor's rapidly increasing tally marks, Churchill and the Doctor both suddenly having weapons in their hands, etc.) Does that mean the scene was filmed so that the Silents just never appeared until the end of it, or were their appearances filmed and the audience just forgot?