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.
Moe: David Bowie's character was this long before it was trendy. Newton also inspires copious amounts of "perverse asexual cuddlelust"; torture scenes and general bad luck aside, he emotes such an intense vulnerability — in every scene — that one is filled with the need to protect him...
Narm: An emotional confrontation between Thomas and Mary-Lou climaxes with him angrily knocking a tray of cookies she is offering him into the air...and in slow-motion to boot.
Also, the random shots of Thomas and Mary-Lou looking into the camera with vacant expressions. (Flight of the Conchords referenced these when their song "Bowie" was visualized for their TV show.)
Thomas freaking out over the cacophony of the Ominous Multiple Screens: "GET OUT OF MY MIND! ALL OF YOU! LEAVE MY MIND ALONE! GO BACK TO WHERE YOU BELONG!"
Tear Jerker: One notable example: When Mary-Lou asks what Thomas's children are like, he replies with a mournful gaze across a lake, "They're like children. Exactly like children." And then there's the Downer Ending: After years of suffering he's stuck on Earth, an alcoholic with no confidante or lover who might help him through the guilt and grief he must be feeling. And We Are As Mayflies to him... Tears? This can induce rage.
Ugly Cute: Thomas's true form; when a picture of it appeared on a Bowie fan-blog, one commenter described it as "Voldemort with a nose", and in-film Mary-Lou finds him hideous. But commentators over at YouTube have likened him and his family (especially with their bodysuits) to teddy bears instead...awwww.
Uncanny Valley: What happens when you cast David Bowie as a waif-like alien visitor. Even in his human disguise, the long black coat and hat that Thomas arrived in are... not quite right for the context. When we first see him, he's disguised as human, but his thinness and clothes him look like a scarecrow, which serves to remind the audience visually of Thomas' otherworldly origin.
Vindicated by History: While the film evokes wildly differing opinions and interpretations to this day and was not a box-office hit, it has enough admirers to not only be in The Criterion Collection, but to serve as one of its first four Blu-Ray releases.
It remains a hit and miss with audiences, but critical opinion of the movie is overwhelmingly positive today, perhaps in part because hell will freeze over before the contemporary movie industry dishes out a genre film as daring and cerebral as The Man Who Fell to Earth.
What The Hell, Casting Agency?: The U.K. trailer warned in voiceover "Nothing you have seen or heard about David Bowie can prepare you for the impact of his first dramatic role in The Man Who Fell to Earth." After all, to see an incredibly vibrant and theatrical personality playing an almost emotionless alien would be a surprise...but it worked out quite well for him. Film critics generally vote this or Merry Christmas, Mr. Lawrence as his best film work, at least as a lead.