The film begins with someone typing a letter of resignation on an Underwood standard, the narration of the entire film is the body of the letter, and the final words of the film are; '...full stop.'
Well, you have me completely stumped. I obviously haven't seen the film, but I'm now intrigued and will be waiting to see if anyone else has the answer.
The pronoun I has always been capitalized in the English language for more than 700 years.