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Is there nudity in Love Actually? (It's been awhile!) Characters include two stand-ins for a porno shoot, meaning that they are used to set up camera angles and so on; in one scene they go through the motions of sex but fully clothed.
And this version of Mycroft is definitely the sort to make such a joke. (Even Spider-Man did it once, iirc, when a British visitor looked the wrong way before crossing a street: “You're in the colonies now.”)
Cheap hand calculators came along soon after I learned to use a slide rule. Pretty sure I never afterward saw anyone, of whatever age, use a slide rule other than to demonstrate its principle.
Laura at the end is younger than the one who (in the erased timeline) had any contact with Maya. —By “kill his wife twice” I think Maya means: send her on a suicide mission and then, when she survived that, sho ot her in person.
Seems to me not believing in gravity could be a call back to the earlier episode when gravity did not “do its job”. (Or did she get pregnant? I have seen only a few episodes.)
In Cannonball Run, Roger Moore plays Seymour Goldfarb who thinks he is Roger Moore (as James Bond, though I think that name is not mentioned). Likely there are other examples like that.
In the last season of Buffy the Vampire Slayer, at least two allusions to Star Trek: Andrew thinks Faith murdered a Vulcan rather than a vulcanologist, and Xander recognizes Klingon poetry on sight.