Orson Welles last movie::

Transformers: The Movie (1986)
Welles', who played the planet-sized nemesis Unicron in the 1986 cartoon flop, described his role as "A big toy who attacks a bunch of smaller toys." He purportedly died on-set of a heart attack.
Source: Associated Press, 6/29/2007

 
   
  Car which James Dean was driving at the time of his death:

Porsche 550 Spyder
Dean was driving on Highway 46 in California on September 30, 1955 when his car collided with another at a desolate intersection. The actor and racing enthusiast was 24 at the time.
Source: The Chicago Sun Times, 6/26/2005

 
   
  Actor who holds the record for appearing in the most movies:

Tom London
According to the Guinness Book of Movie Facts & Feats (1993), London appeared in over 2,000 movies including "All Quiet on the Western Front" in 1930. London died in 1963 at the age of 81.
Source: The Boston Globe, 3/18/1999

 
   
  Original name of actor Boris Karloff:

William Henry Pratt
Karloff is best known for his role as the monster in the 1931 film "Frankenstein".
Source: The Atlanta Journal-Constitution, 11/12/2004