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.
Genius Bonus: There are some obscure references to Holmes trivia. For example, when Holmes first meets John Watson, he guesses that his first name is James. In "The Man with the Twisted Lip", one of the original Sherlock Holmes stories, Watson's wife addresses him as "James", causing rampant speculation from the fans about whether this was a significant slip or just a sign that Doyle had forgotten his own character's name.
Seinfeld Is Unfunny: With CGI being so ubiquitous now, it's hard to appreciate just how mind blowing that stained glass knight was at the time.
Suspiciously Similar Song: The cultists performing a human sacrifice chant a song which rips off "O Fortuna" from Carmen Burana.
Viewers are British: The Sdrawkcab Name clue of "Eh tar" being backwards for "Rathe" is a lot harder to spot if you speak a rhotic accent than a non-rhotic one, since with the former you're unlikely to recognize the implied "r" at the end of "Eh tar" in pronunciation (pronounced "etah" in the movie) in the first place.