Connections

many flashback clips are featured

clips from the film is shown

discussing other works of Uwe Boll

One of the achievements is called "Bill Williamson"

Mentioned by the Snob.

When you complete all Rampages (also known as Going POSTAL tasks), you earn the achievement "One of Uwe's Best". A reference to the film directed by Uwe Boll.

The movie is mentioned.

Same basic story structure of a man violently lashing out against pet peeves

Bill calls a man 'Forrest' as the man runs away