First written use of the term "trailer" to refer to a preview before a film:

1928
According to the Oxford English Dictionary, the first recorded use of the word "trailer" to refer to a movie preview appeared in March 11, 1928 edition of The New York Times, which described a trailer as "a few hundred feet of film announcing a forthcoming picture."
Source: The Express, 4/10/2010

 
   
  Number of years the longest continuously-operating movie theatre showed movies before it closed in March 2008:

92
On March 10, 2008, the screen at the Ridgewood Theatre in Queens, New York was dark for the first time since its opening on December 23, 1916, after 92 years in which it showed at least one movie every day. According to the Theater Historical Society of America, the Ridgewood was the longest continuously-operated movie theatre in the U.S.
Source: New York Times, 2/8/2009

 
   
  First feature-length film in 3-D:

Bwana Devil
On November 26, 1952, the first feature-length 3-D film, "Bwana Devil," premiered, an African adventure film starring Robert Stack, Nigel Bruce and Barbara Britton.
Source: Los Angeles Times, 9/10/2003

 
   
 
Library of Congress
First use of the term "movie star":

1919
According to the Oxford English Dictionary, the term "movie star" was first used in a book called "Ma Pettengill" comparing the President's salary to "some movie star's."
Source: Oxford English Dictionary,