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* CaliforniaDoubling: Much of Berlin was filmed in Swansea.
* DawsonCasting: Amy, Rory and Mels' high-school selves are played by their regular actors.
* DeletedScene: A motorcycle ChaseScene between the Teselecta (disguised as a German soldier) and Amy and Rory was cut because of the budget.
* FakeNationality: The English Albert Wenning as UsefulNotes/AdolfHitler.
* RealitySubtext: Melody mentions taking her age down a bit. "Just gradually. To freak people out." Because, of course, it was a slightly younger Creator/AlexKingston playing the older River Song.
* ReferencedBy: This episode was referenced during the 84th UsefulNotes/{{Academy Award}}s, during a spoof of ''Film/MidnightInParis''. As Music/JustinBieber ducks inside the vintage car, he finds Creator/SammyDavisJr holding a sonic screwdriver and announcing, "And then we're gonna kill Hitler!"
* TroubledProduction: Creator/StevenMoffat was overseeing six episodes of ''Doctor Who'', making three film-length episodes of ''Series/{{Sherlock}}'' and writing ''WesternAnimation/TheAdventuresOfTintin2011'', and was stretched too thin and overworked. When filming was due to commence on "Let's Kill Hitler", Moffat's only option was to hand the actors his first draft and hope for the best. Most of the problems people have with the episode are things like lazy filler jokes ("She's trying to kill me... plus, she's a woman!") and the lack of anything addressing the brutal finale of the last series, which likely would have been fixed had Moffat had more time to write it.
* WhatCouldHaveBeen: Creator/JennaColeman was considered for Melody Pond before going to Nina Toussaint-White.

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