Joaquin Phoenix auditioned for the role of Louis Simo, but Adrien Brody got it. This is the second time the two have auditioned for the same role. In The Village (2004), both men auditioned for the role of Lucius Hunt, with Phoenix getting the role.
During on-the-set scene of George Reeves "flying" during filming of Adventures of Superman, background music is playing on set. Except for playback on musical numbers, there would no need for canned music on set as it would be added later.
The elevators in the hotel lobby have LED displays above the doors (to show the floor number). These were not developed commercially until the mid-1960s and did not become common until well after that.
It is 1959, well in to the golden age of broadcast television, yet there are virtually no television antennas visible on the roofs of any of the houses in the shots of the "period" neighborhoods.
The following FAQ entries may contain spoilers. Only the biggest ones (if any) will be covered with spoiler tags. It is assumed that no one who is diligently avoiding spoilers will be visiting this page in the first place.
Q
How much sex, violence, and profanity are in this movie?
A
For detailed information about the amounts and types of (a) sex and nudity, (b) violence and gore, (c) profanity, (d) alcohol, drugs, and smoking, and (e) frightening and intense scenes in this movie, consult the IMDb Parents Guide for this movie. The Parents Guide for Hollywoodland can be found at http://www.imdb.com/title/tt0427969/parentalguide.