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.
Manic Pixie Dream Girl: Somewhat mature example. But Sara is a tuba playing journalist, who understands how absurd L.A is.
Subverted with SanDeE*. Although she comes off as this at first, and certainly makes a try at it; she doesn't really make any significant change to Harris's life. Eventually, the relationship is treated as just a bad rebound thing; which temporarily got in the way of a real relationship with Sara.
The Red Stapler: Fans were disappointed to find out those shoe-skates don't exist.
What Could Have Been: John Lithgow was going to be in the film as super-agent Harry Zell, and some of his scenes appear in some trailers for it, but was eventually cut. He can still be seen as the man in the distance talking to the magical Road Sign before Harrison himself encounters the sign, but all of his dialogue is gone. The cut scenes are available on some DVD versions.