Final answer:
The 2004 movie that won the Oscar for 'Best Original Screenplay' and features the fictional company Lacuna Inc. is 'Eternal Sunshine of the Spotless Mind'.
Step-by-step explanation:
The 2004 movie that won the Oscar for 'Best Original Screenplay' and features the fictional company Lacuna Inc. is Eternal Sunshine of the Spotless Mind. The film explores the concept of memory erasure and follows the main character, Joel, as he undergoes a procedure to erase his memories of a failed relationship. Lacuna Inc. is the company responsible for performing the memory erasure.