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.
Common Knowledge: If you've heard the complaints about the movie's ending, you've likely heard them centered around the sheer stupidity of "aliens showing up to fix everything at the last minute". Actually, the creatures in the final scene are never said to be aliens, and Word of God has repeatedly stated that they're just the highly evolved descendants of the mecha.
Ending Fatigue: Some believe that the movie should have ended with David continuously wishing to be a real boy to the carnival Blue Fairy underwater (and still others feel it should have ended with David committing suicide)... but it kept going... and going... AND GOING.
Freud Was Right: David's entire journey is ultimately about winning the unconditional love of his mommy.
"Funny Aneurysm" Moment: Scenes of frozen, distant-future New York City include the twin towers of the World Trade Center poking out of the ice. Spielberg made a conscious decision to leave them in, knowing he would take flak for it either way. Cinemas though (including outside America - the UK was affected) did have signs put up making them aware that footage of the towers featured in case of accidental offence.
Uncanny Valley: Turned on its head here, as most of the humanlike robots are played by live actors - but used to very good effect with CGI-enhanced, partially-broken androids, and many scenes where David just doesn't... seem... quite... human. Like the one where he "breaks" after eating human food. This troper recalls hearing that Osment suggested that David should never blink.
The main character's actions can be very unnerving sometimes, which gives a subtle indication that in spite of his emotions and fleshy exterior, he is still a machine. The thrown away, out-dated robots that are seen rummaging through a pile of leftover robotic parts in the forest also qualify, but most definitely the "nanny" robot, who happens to be missing 3/4s of her head.
Jude Law's face was sprayed with latex, and his hairline was painted to make it look like a seam, thus make him bizarrely too-perfect to look real.
Notably, Roger Ebert initially gave it a score of 3 stars out of 4, and criticized the ending, but now has included it in his "Great Movies" list.
Also, what might have helped was the revelation that Kubrick was largely responsible for the film's ending, and Spielberg did his best to incorporate it. Truth be told, it really was an ambitious project between two very different directors, as well as a heartwarming sendoff from one friend to another.
The Woobie: Oh, come on. Who didn't want to reach through the screen and give poor little David a hug?